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多发性硬化症:修订间差异

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{{Infobox medical condition (new)
{{roughtranslation|time=2015-04-04T05:55:13+00:00}}
| name = Multiple sclerosis
{{medical}}
| image = MS Demyelinisation CD68 10xv2.jpg
{{Infobox_Disease
| caption = Demyelination by MS. The [[CD68]] colored tissue shows several [[macrophage]]s in the area of the lesion.
| Name = 多發性硬化症<br>Multiple sclerosis
| field = [[Neurology]]
| Image = MS Demyelinisation CD68 10xv2.jpg
| synonyms = Disseminated sclerosis, encephalomyelitis disseminata
| Caption = 多发性硬化症脱髓鞘 CD68染色的组织显示病灶区域存在巨噬细胞 原始比例1:100
| symptoms = Double vision, [[blindness]] in one eye, muscle weakness, trouble with [[sensation (psychology)|sensation]], trouble with coordination<ref name=NIH2015/>
| DiseasesDB = 8412
| complications =
| ICD10 = {{ICD10|G|35||g|35}}
| ICD9 = {{ICD9|340}}
| onset = Age 20–50<ref name=Milo2010/>
| ICDO =
| duration = Long term<ref name=NIH2015/>
| OMIM = 126200
| causes = Unknown<ref name=Nak2012/>
| MedlinePlus = 000737
| risks =
| diagnosis = Based on symptoms and medical tests<ref name=Tsang2011/>
| eMedicineSubj = neuro
| eMedicineTopic = 228
| differential =
| prevention =
| eMedicine_mult = {{eMedicine2|oph|179}} {{eMedicine2|emerg|321}} {{eMedicine2|pmr|82}} {{eMedicine2|radio|461}}
| treatment = Medications, physical therapy<ref name=NIH2015/>
| MeshID = D009103
| medication =
| prognosis = 5–10 year shorter [[life expectancy]]<ref name="pmid18970977"/>
| frequency = 2 million (2015)<ref name=GBD2015Pre>{{cite journal | author = GBD 2015 Disease and Injury Incidence and Prevalence Collaborators | title = Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990–2015: a systematic analysis for the Global Burden of Disease Study 2015 | journal = Lancet | volume = 388 | issue = 10053 | pages = 1545–1602 | date = October 2016 | pmid = 27733282 | pmc = 5055577 | doi = 10.1016/S0140-6736(16)31678-6 }}</ref>
| deaths = 18,900 (2015)<ref name=GBD2015De>{{cite journal | author = GBD 2015 Mortality and Causes of Death Collaborators | title = Global, regional, and national life expectancy, all-cause mortality, and cause-specific mortality for 249 causes of death, 1980–2015: a systematic analysis for the Global Burden of Disease Study 2015 | journal = Lancet | volume = 388 | issue = 10053 | pages = 1459–1544 | date = October 2016 | pmid = 27733281 | pmc = 5388903 | doi = 10.1016/s0140-6736(16)31012-1 }}</ref>
}}
}}
<!-- Definition and symptoms -->
'''Multiple sclerosis''' ('''MS''') is a [[demyelinating disease]] in which the [[myelin sheaths|insulating covers]] of [[neurons|nerve cells]] in the [[Human brain|brain]] and [[spinal cord]] are damaged.<ref name=NIH2015>{{cite web|title=NINDS Multiple Sclerosis Information Page|url=http://www.ninds.nih.gov/disorders/multiple_sclerosis/multiple_sclerosis.htm|website=National Institute of Neurological Disorders and Stroke|access-date=6 March 2016|date=19 November 2015|deadurl=yes|archive-url=https://web.archive.org/web/20160213025406/http://www.ninds.nih.gov/disorders/multiple_sclerosis/multiple_sclerosis.htm|archive-date=13 February 2016}}</ref> This damage disrupts the ability of parts of the nervous system to communicate, resulting in a range of [[medical sign|signs]] and [[symptom]]s, including physical, [[cognitive disability|mental]], and sometimes psychiatric problems.<ref name="pmid18970977">{{cite journal | vauthors = Compston A, Coles A |author1-link=Alastair Compston | title = Multiple sclerosis | journal = Lancet | volume = 372 | issue = 9648 | pages = 1502–17 | date = October 2008 | pmid = 18970977 | doi = 10.1016/S0140-6736(08)61620-7 }}</ref><ref name="pmid11955556">{{cite journal | vauthors = Compston A, Coles A | title = Multiple sclerosis | journal = Lancet | volume = 359 | issue = 9313 | pages = 1221–31 | date = April 2002 | pmid = 11955556 | doi = 10.1016/S0140-6736(02)08220-X }}</ref><ref>{{cite book|title=Bradley's neurology in clinical practice.|year=2012|publisher=Elsevier/Saunders|location=Philadelphia, PA|isbn=1-4377-0434-4|edition=6th|vauthors=Murray ED, Buttner EA, Price BH |veditors=Daroff R, Fenichel G, Jankovic J, Mazziotta J |chapter=Depression and Psychosis in Neurological Practice}}</ref> Specific symptoms can include double vision, [[blindness]] in one eye, muscle weakness, trouble with [[sensation (psychology)|sensation]], or trouble with coordination.<ref name=NIH2015/> MS takes several forms, with new symptoms either occurring in isolated attacks (relapsing forms) or building up over time (progressive forms).<ref name="pmid8780061">{{cite journal | vauthors = Lublin FD, Reingold SC | author1-link=Fred D. Lublin | title = Defining the clinical course of multiple sclerosis: results of an international survey. National Multiple Sclerosis Society (USA) Advisory Committee on Clinical Trials of New Agents in Multiple Sclerosis | journal = Neurology | volume = 46 | issue = 4 | pages = 907–11 | date = April 1996 | pmid = 8780061 | doi = 10.1212/WNL.46.4.907 }}</ref> Between attacks, symptoms may disappear completely; however, permanent neurological problems often remain, especially as the disease advances.<ref name="pmid8780061"/>


<!--Cause, pathophysiology and diagnosis -->
'''多发性硬化症'''([[英文]]:'''Multiple Sclerosis''')是一种慢性、炎症性、脱髓鞘的[[中枢神经系统]]疾病。可引起各种症状,包括感觉改变、视觉障碍、肌肉无力、忧郁、协调与讲话困难、严重的疲劳、认知障碍、平衡障碍、体热和疼痛等,严重的可以导致活动性障碍和残疾。多发性硬化症影响[[脑]]和[[脊髓]]的神经细胞──[[神经元]]。神经元传递信息,形成思维和感觉,以使大脑控制身体。保护这些神经元的脂质层为[[髓鞘]](Myelin Sheath),协助神经元进行电信号传递。多发性硬化症逐渐造成大脑和脊髓的斑块性的神经髓鞘的破坏(脱髓鞘),髓鞘的瘢痕形成影响神经[[轴突]]的信号传递,以失去大脑和脊髓对外周的控制,以至多部位的僵硬或丧失功能。
While the cause is not clear, the underlying mechanism is thought to be either [[autoimmune disease|destruction by the immune system]] or failure of the [[myelin]]-producing cells.<ref name=Nak2012>{{cite journal | vauthors = Nakahara J, Maeda M, Aiso S, Suzuki N | title = Current concepts in multiple sclerosis: autoimmunity versus oligodendrogliopathy | journal = Clinical Reviews in Allergy & Immunology | volume = 42 | issue = 1 | pages = 26–34 | date = February 2012 | pmid = 22189514 | doi = 10.1007/s12016-011-8287-6 }}</ref> Proposed causes for this include [[genetics]] and environmental factors such as being triggered by a [[viral infection]].<ref name="pmid11955556"/><ref name="pmid17444504">{{cite journal | vauthors = Ascherio A, Munger KL | title = Environmental risk factors for multiple sclerosis. Part I: the role of infection | journal = Annals of Neurology | volume = 61 | issue = 4 | pages = 288–99 | date = April 2007 | pmid = 17444504 | doi = 10.1002/ana.21117 }}</ref> MS is usually diagnosed based on the presenting signs and symptoms and the results of supporting medical tests.<ref name=Tsang2011>{{cite journal | vauthors = Tsang BK, Macdonell R | title = Multiple sclerosis- diagnosis, management and prognosis | journal = Australian Family Physician | volume = 40 | issue = 12 | pages = 948–55 | date = December 2011 | pmid = 22146321 }}</ref>


<!--Treatment, prognosis -->
多发性硬化症的平均发病年龄一般在20至40歲,女性发病人数两倍于男性<ref>Calabresi PA.Diagnosis and management of multiple sclerosis. Am Fam Physician. http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15571060</ref>。多发性硬化症的病因不清,多被认为是[[自身免疫性疾病]]<ref>Altmann D (2005). "Evaluating the evidence for multiple sclerosis as an autoimmune disease". Arch. Neurol. 62 (4): 688; author reply 688-9. </ref>。少数人认为是一种代谢依赖性神经变性疾病。目前尚无有效的根治办法。
There is no known cure for multiple sclerosis.<ref name=NIH2015/> Treatments attempt to improve function after an attack and prevent new attacks.<ref name="pmid11955556"/> Medications used to treat MS, while modestly effective, can have side effects and be poorly tolerated.<ref name=NIH2015/> [[Physical therapy]] can help with people's ability to function.<ref name=NIH2015/> Many people pursue alternative treatments, despite a lack of evidence of benefit.<ref name="pmid16420779">{{cite journal | vauthors = Huntley A | title = A review of the evidence for efficacy of complementary and alternative medicines in MS | journal = International MS Journal | volume = 13 | issue = 1 | pages = 5–12, 4 | date = January 2006 | pmid = 16420779 | doi = }}</ref> The long-term outcome is difficult to predict, with good outcomes more often seen in women, those who develop the disease early in life, those with a relapsing course, and those who initially experienced few attacks.<ref name="pmid8017890">{{cite journal | vauthors = Weinshenker BG | title = Natural history of multiple sclerosis | journal = Annals of Neurology | volume = 36 Suppl | issue = Suppl | pages = S6-11 | year = 1994 | pmid = 8017890 | doi = 10.1002/ana.410360704 }}</ref> [[Life expectancy]] is on average 5 to 10 years lower than that of an unaffected population.<ref name="pmid18970977"/>


<!--Epidemiology and history -->
== 流行病學 ==
Multiple sclerosis is the most common [[immune disorder|immune-mediated disorder]] affecting the [[central nervous system]].<ref name="pmid24746689">{{cite journal | vauthors = Berer K, Krishnamoorthy G | title = Microbial view of central nervous system autoimmunity | journal = FEBS Letters | volume = 588 | issue = 22 | pages = 4207–13 | date = November 2014 | pmid = 24746689 | doi = 10.1016/j.febslet.2014.04.007 }}</ref> In 2015, about 2.3 million people were affected globally with rates varying widely in different regions and among different populations.<ref name=GBD2015Pre/><ref name=Atlas2008>{{cite book |author=World Health Organization |title=Atlas: Multiple Sclerosis Resources in the World 2008 |publisher=World Health Organization |location=Geneva |year=2008 |pages=15–16 |isbn=92-4-156375-3 |url=http://whqlibdoc.who.int/publications/2008/9789241563758_eng.pdf |deadurl=no |archive-url=https://web.archive.org/web/20131004215703/http://whqlibdoc.who.int/publications/2008/9789241563758_eng.pdf |archive-date=4 October 2013 }}</ref> That year about 18,900 people died from MS, up from 12,000 in 1990.<ref name=GBD2015De/><ref name=GDB2013>{{cite journal | vauthors = | title = Global, regional, and national age-sex specific all-cause and cause-specific mortality for 240 causes of death, 1990–2013: a systematic analysis for the Global Burden of Disease Study 2013 | journal = Lancet | volume = 385 | issue = 9963 | pages = 117–71 | date = January 2015 | pmid = 25530442 | pmc = 4340604 | doi = 10.1016/S0140-6736(14)61682-2 }}</ref> The disease usually begins between the ages of 20 and 50 and is twice as common in women as in men.<ref name=Milo2010>{{cite journal | vauthors = Milo R, Kahana E | title = Multiple sclerosis: geoepidemiology, genetics and the environment | journal = Autoimmunity Reviews | volume = 9 | issue = 5 | pages = A387-94 | date = March 2010 | pmid = 19932200 | doi = 10.1016/j.autrev.2009.11.010 }}</ref> MS was first described in 1868 by [[Jean-Martin Charcot]].<ref name="Charcot1"/> The name ''multiple sclerosis'' refers to the numerous [[glial scar|scar]]s (sclerae—better known as plaques or lesions) that develop on the [[white matter]] of the brain and spinal cord.<ref name="Charcot1">{{cite journal | vauthors = Clanet M | title = Jean-Martin Charcot. 1825 to 1893 | journal = International MS Journal | volume = 15 | issue = 2 | pages = 59–61 | date = June 2008 | pmid = 18782501 | url = http://www.msforum.net/Site/ViewPDF/ViewPDF.aspx?ArticleID=E80DC748-5048-4BD2-9393-18BCAE0A1514&doctype=Article | format = PDF }}<br />* {{cite journal |author=Charcot, J. |year=1868 |title=Histologie de la sclerose en plaques |journal=Gazette des hopitaux, Paris |volume=41 |pages=554–5 }}</ref> A number of new treatments and diagnostic methods are under development.<ref name="pmid19597083">{{cite journal | vauthors = Cohen JA | title = Emerging therapies for relapsing multiple sclerosis | journal = Archives of Neurology | volume = 66 | issue = 7 | pages = 821–8 | date = July 2009 | pmid = 19597083 | doi = 10.1001/archneurol.2009.104 }}</ref>
多發性硬化症(MS)[[盛行率]]依國家或特定族群不同介於每100,000人中2人至150人之間<ref name="pmid11603614">{{cite journal
{{TOC limit|3}}
|author=Rosati G
|title=The prevalence of multiple sclerosis in the world: an update
|journal=Neurol. Sci.
|volume=22
|issue=2
|pages=117–39
|pmid=11603614
|doi=10.1007/s100720170011
|date=April 2001}}</ref>。
族群和地理模式的[[流行病學]] 研究方法已經常用於MS,而且導致不同[[原因論|病因學說]]的提出<ref name="pmid17444504">{{cite journal
|author=Ascherio A, Munger KL
|title=Environmental risk factors for multiple sclerosis. Part I: the role of infection
|journal=Ann. Neurol.
|volume=61
|issue=4
|pages=288–99
|pmid=17444504
|doi=10.1002/ana.21117
|date=April 2007}}</ref><ref name="pmid15556803">{{cite journal
|author=Marrie RA
|title=Environmental risk factors in multiple sclerosis aetiology
|journal=Lancet Neurol
|volume=3
|issue=12
|pages=709–18
|pmid=15556803
|doi=10.1016/S1474-4422(04)00933-0
|date=December 2004}}</ref><ref name="pmid17492755">{{cite journal
|author=Ascherio A, Munger KL
|title=Environmental risk factors for multiple sclerosis. Part II: Noninfectious factors
|journal=Ann. Neurol.
|volume=61
|issue=6
|pages=504–13
|pmid=17492755
|doi=10.1002/ana.21141
|date=June 2007}}{{cite journal|author=Kurtzke JF
|title=Epidemiologic evidence for multiple sclerosis as an infection
|journal=Clin. Microbiol. Rev.
|volume=6
|issue=4
|pages=382–427
|pmid=8269393
|pmc=358295
|url=http://cmr.asm.org/cgi/pmidlookup?view=long&pmid=8269393
|date=October 1993}}</ref>
[[File:Lapland Mother NGM-v31-p556.jpg|thumb|某些族群如[[薩米人]],MS發生率較低,可能是基因因素所導致。]]
[[File:Symptoms of multiple sclerosis zh-tw.svg|thumb|right|多發性硬化症的主要症狀。]]
MS通常出現於30歲早期的成人,但也可能出現於小孩<ref name="pmid18970977">{{cite journal
|author=Compston A, Coles A
|title=Multiple sclerosis
|journal=Lancet
|volume=372
|issue=9648
|pages=1502–17
|pmid=18970977
|doi=10.1016/S0140-6736(08)61620-7
|url=
|date=October 2008}}</ref>。首要的漸進型亞型在30餘歲人群更常見<ref name="pmid17884680">{{cite journal
|author=Miller DH, Leary SM
|title=Primary-progressive multiple sclerosis
|journal=Lancet Neurol
|volume=6
|issue=10
|pages=903–12
|pmid=17884680
|doi=10.1016/S1474-4422(07)70243-0
|date=October 2007}}</ref>。就許多自體免疫疾病而言,此疾病在女性更常見,且有增加的趨勢<ref name="pmid18970977"/><ref name="pmid18606967">{{cite journal
|author=Alonso A, Hernán MA
|title=Temporal trends in the incidence of multiple sclerosis: a systematic review
|journal=Neurology
|volume=71
|issue=2
|pages=129–35
|pmid=18606967
|doi=10.1212/01.wnl.0000316802.35974.34
|date=July 2008}}</ref>。在小孩,性別比率差異更高<ref name="pmid18970977"/>,但是在超過50歲的人群,MS侵襲男性和女性幾乎相等<ref name="pmid17884680"/>。
在北半球有由北向南的梯度變化,而南半球有向南到北的梯度變化,MS在[[赤道]]附近居住的人群較不常見<ref name="pmid18970977"/><ref name="pmid18606967"/>。[[氣候]]、[[陽光]]和攝取[[維他命D]]已列為可能解釋緯度梯度的病因在研究<ref name="pmid17492755"/>。然而在由北到南的模式中有重要例外,且盛行率隨時間改變<ref name="pmid18970977"/>。總的說來此趨勢可能會消失<ref name="pmid18606967"/>。這指出其他因子如環境和基因必須列入解釋MS的原因<ref name="pmid18970977"/>。MS也常見於歐洲北部族群分佈區域<ref name="pmid18970977"/>,但是在這些MS常見的區域,某些種族群體發病風險較低<ref name="pmid15556803"/>。


==Signs and symptoms==
孩童時期的環境因子在日後MS發病可能佔重要角色。幾個移民研究顯示,若15歲以前移民,移民者就會受到新地區的MS敏感性影響,若15歲以後移民,移民者就會受到原地區的MS敏感性影響<ref name="pmid18970977"/><ref name="pmid15556803"/>。然而年齡─地理性MS發病風險可能橫跨更大的時間尺度<ref name="pmid18970977"/>。已建立的出生季節與MS關連性增添了與陽光和維他命D關聯性的支持。例如,十一月出生的人群較五月出生的人群少罹患MS<ref>{{cite journal |author=Kulie T, Groff A, Redmer J, Hounshell J, Schrager S |title=Vitamin D: an evidence-based review |journal=J Am Board Fam Med |volume=22 |issue=6 |pages=698–706 |year=2009 |pmid=19897699 |doi=10.3122/jabfm.2009.06.090037 |url=}}</ref>。
{{Main|Multiple sclerosis signs and symptoms}}
[[File:Symptoms of multiple sclerosis.svg|thumb|upright=1.3|Main symptoms of multiple sclerosis]]


A person with MS can have almost any neurological symptom or sign, with [[autonomic nervous system|autonomic]], visual, motor, and sensory problems being the most common.<ref name="pmid18970977"/> The specific symptoms are determined by the locations of the lesions within the nervous system, and may include [[hypoesthesia|loss of sensitivity]] or [[paresthesia|changes in sensation]] such as tingling, pins and needles or numbness, muscle weakness, [[blurred vision]],<ref>{{cite web|url=http://www.webmd.com/multiple-sclerosis/|title=MS Signs|last=|first=|date=|website=[[Webmd]]|access-date=7 October 2016|deadurl=no|archive-url=https://web.archive.org/web/20160930181511/http://www.webmd.com/multiple-sclerosis/|archive-date=30 September 2016}}</ref> [[clonus|very pronounced reflexes]], [[muscle spasms]], or difficulty in moving; difficulties with coordination and balance ([[ataxia]]); [[dysarthria|problems with speech]] or [[dysphagia|swallowing]], visual problems ([[nystagmus]], [[optic neuritis]] or [[diplopia|double vision]]), [[fatigue (physical)|feeling tired]], [[acute pain|acute]] or [[chronic pain]], and bladder and bowel difficulties, among others.<ref name="pmid18970977"/> Difficulties thinking and emotional problems such as [[clinical depression|depression]] or [[labile affect|unstable mood]] are also common.<ref name="pmid18970977"/> [[Uhthoff's phenomenon]], a worsening of symptoms due to exposure to higher than usual temperatures, and [[Lhermitte's sign]], an electrical sensation that runs down the back when bending the neck, are particularly characteristic of MS.<ref name="pmid18970977"/> The main measure of disability and severity is the [[expanded disability status scale]] (EDSS), with other measures such as the [[multiple sclerosis functional composite]] being increasingly used in research.<ref>{{cite journal | vauthors = Kurtzke JF | author-link=John F. Kurtzke | title = Rating neurologic impairment in multiple sclerosis: an expanded disability status scale (EDSS) | journal = Neurology | volume = 33 | issue = 11 | pages = 1444–52 | date = November 1983 | pmid = 6685237 | doi = 10.1212/WNL.33.11.1444 }}</ref><ref name="pmid10467378">{{cite journal | vauthors = Amato MP, Ponziani G | title = Quantification of impairment in MS: discussion of the scales in use | journal = Multiple Sclerosis | volume = 5 | issue = 4 | pages = 216–9 | date = August 1999 | pmid = 10467378 | doi = 10.1191/135245899678846113 }}</ref><ref name="pmid12356200">{{cite journal | vauthors = Rudick RA, Cutter G, Reingold S | title = The multiple sclerosis functional composite: a new clinical outcome measure for multiple sderosis trials | journal = Multiple Sclerosis | volume = 8 | issue = 5 | pages = 359–65 | date = October 2002 | pmid = 12356200 | doi = 10.1191/1352458502ms845oa }}</ref>
== 参考文献 ==
{{Reflist|30em}}


The condition begins in 85% of cases as a [[clinically isolated syndrome]] (CIS) over a number of days with 45% having motor or sensory problems, 20% having [[optic neuritis]], and 10% having symptoms related to [[brainstem]] dysfunction, while the remaining 25% have more than one of the previous difficulties.<ref name=Tsang2011/> The course of symptoms occurs in two main patterns initially: either as episodes of sudden worsening that last a few days to months (called [[relapse]]s, exacerbations, bouts, attacks, or flare-ups) followed by improvement (85% of cases) or as a gradual worsening over time without periods of recovery (10–15% of cases).<ref name=Milo2010/> A combination of these two patterns may also occur<ref name="pmid8780061"/> or people may start in a relapsing and remitting course that then becomes progressive later on.<ref name=Milo2010/> Relapses are usually not predictable, occurring without warning.<ref name="pmid18970977"/> Exacerbations rarely occur more frequently than twice per year.<ref name="pmid18970977"/> Some relapses, however, are preceded by common triggers and they occur more frequently during spring and summer.<ref name="pmid16804331">{{cite journal | vauthors = Tataru N, Vidal C, Decavel P, Berger E, Rumbach L | title = Limited impact of the summer heat wave in France (2003) on hospital admissions and relapses for multiple sclerosis | journal = Neuroepidemiology | volume = 27 | issue = 1 | pages = 28–32 | year = 2006 | pmid = 16804331 | doi = 10.1159/000094233 }}</ref> Similarly, viral infections such as the [[common cold]], [[influenza]], or [[gastroenteritis]] increase their risk.<ref name="pmid18970977"/> [[Stress (medicine)|Stress]] may also trigger an attack.<ref name="pmid17439878">{{cite journal | vauthors = Heesen C, Mohr DC, Huitinga I, Bergh FT, Gaab J, Otte C, Gold SM | title = Stress regulation in multiple sclerosis: current issues and concepts | journal = Multiple Sclerosis | volume = 13 | issue = 2 | pages = 143–8 | date = March 2007 | pmid = 17439878 | doi = 10.1177/1352458506070772 }}</ref> Women with MS [[intercurrent disease in pregnancy|who become pregnant]] experience fewer relapses; however, during the first months after delivery the risk increases.<ref name="pmid18970977"/> Overall, pregnancy does not seem to influence long-term disability.<ref name="pmid18970977"/> Many events have been found not to affect relapse rates including vaccination, breast feeding,<ref name="pmid18970977"/> physical trauma,<ref name="pmid11205361">{{cite journal | vauthors = Martinelli V | title = Trauma, stress and multiple sclerosis | journal = Neurological Sciences | volume = 21 | issue = 4 Suppl 2 | pages = S849-52 | year = 2000 | pmid = 11205361 | doi = 10.1007/s100720070024 | url = http://link.springer-ny.com/link/service/journals/10072/bibs/00214%20Suppl%202/0021S849.htm }}{{dead link|date=September 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> and Uhthoff's phenomenon.<ref name="pmid16804331"/>
== 外部連結 ==

==Causes==
The cause of MS is unknown; however, it is believed to occur as a result of some combination of genetic and environmental factors such as infectious agents.<ref name="pmid18970977"/> Theories try to combine the data into likely explanations, but none has proved definitive. While there are a number of environmental risk factors and although some are partly modifiable, further research is needed to determine whether their elimination can prevent MS.<ref name="pmid15556803"/>

===Geography===
MS is more common in people who live farther from the [[equator]], although exceptions exist.<ref name="pmid18970977"/><ref name="pmid18606967"/> These exceptions include ethnic groups that are at low risk far from the equator such as the [[Sami people|Samis]], [[Indigenous peoples of the Americas|Amerindians]], Canadian [[Hutterite]]s, New Zealand [[Māori people|Māori]],<ref name="pmid12127652">{{cite journal | vauthors = Pugliatti M, Sotgiu S, Rosati G | title = The worldwide prevalence of multiple sclerosis | journal = Clinical Neurology and Neurosurgery | volume = 104 | issue = 3 | pages = 182–91 | date = July 2002 | pmid = 12127652 | doi = 10.1016/S0303-8467(02)00036-7 }}</ref> and Canada's [[Inuit]],<ref name=Milo2010/> as well as groups that have a relatively high risk close to the equator such as [[Sardinians]],<ref name=Milo2010/> inland [[Sicily|Sicilians]],<ref>{{cite journal | vauthors = Grimaldi LM, Salemi G, Grimaldi G, Rizzo A, Marziolo R, Lo Presti C, Maimone D, Savettieri G | title = High incidence and increasing prevalence of MS in Enna (Sicily), southern Italy | journal = Neurology | volume = 57 | issue = 10 | pages = 1891–3 | date = November 2001 | pmid = 11723283 | doi = 10.1212/wnl.57.10.1891 }}</ref> [[Palestinians]], and [[Parsi]].<ref name="pmid12127652"/> The cause of this geographical pattern is not clear.<ref name=Milo2010/> While the north-south gradient of incidence is decreasing,<ref name="pmid18606967"/> as of 2010 it is still present.<ref name=Milo2010/>

MS is more common in regions with northern European populations<ref name="pmid18970977"/> and the geographic variation may simply reflect the global distribution of these high-risk populations.<ref name=Milo2010/> Decreased sunlight exposure resulting in decreased [[vitamin D]] production has also been put forward as an explanation.<ref name="pmid17492755"/><ref name="pmid20494325">{{cite journal | vauthors = Ascherio A, Munger KL, Simon KC | title = Vitamin D and multiple sclerosis | journal = The Lancet. Neurology | volume = 9 | issue = 6 | pages = 599–612 | date = June 2010 | pmid = 20494325 | doi = 10.1016/S1474-4422(10)70086-7 }}</ref><ref>{{cite journal | vauthors = Koch MW, Metz LM, Agrawal SM, Yong VW | title = Environmental factors and their regulation of immunity in multiple sclerosis | journal = Journal of the Neurological Sciences | volume = 324 | issue = 1–2 | pages = 10–6 | date = January 2013 | pmid = 23154080 | doi = 10.1016/j.jns.2012.10.021 }}</ref> A relationship between season of birth and MS lends support to this idea, with fewer people born in the northern hemisphere in November as compared to May being affected later in life.<ref name="pmid19897699">{{cite journal | vauthors = Kulie T, Groff A, Redmer J, Hounshell J, Schrager S | title = Vitamin D: an evidence-based review | journal = Journal of the American Board of Family Medicine | volume = 22 | issue = 6 | pages = 698–706 | year = 2009 | pmid = 19897699 | doi = 10.3122/jabfm.2009.06.090037 }}</ref> Environmental factors may play a role during childhood, with several studies finding that people who move to a different region of the world before the age of 15 acquire the new region's risk to MS. If migration takes place after age 15, however, the person retains the risk of their home country.<ref name="pmid18970977"/><ref name="pmid15556803"/> There is some evidence that the effect of moving may still apply to people older than 15.<ref name="pmid18970977"/>

===Genetics===
[[File:HLA.svg|thumb|HLA region of Chromosome&nbsp;6. Changes in this area increase the probability of getting MS.]]
MS is not considered a [[hereditary]] disease; however, a number of [[genetics|genetic variations]] have been shown to increase the risk.<ref name="pmid14747002">{{cite journal | vauthors = Dyment DA, Ebers GC, Sadovnick AD | title = Genetics of multiple sclerosis | journal = The Lancet. Neurology | volume = 3 | issue = 2 | pages = 104–10 | date = February 2004 | pmid = 14747002 | doi = 10.1016/S1474-4422(03)00663-X }}</ref> Some of these genes appear to have higher levels of expression in microglial cells than expected by chance.<ref name="SkeneGrant2016">{{cite journal | vauthors = Skene NG, Grant SG | title = Identification of Vulnerable Cell Types in Major Brain Disorders Using Single Cell Transcriptomes and Expression Weighted Cell Type Enrichment | journal = Frontiers in Neuroscience | volume = 10 | pages = 16 | year = 2016 | pmid = 26858593 | doi = 10.3389/fnins.2016.00016 }}</ref> The probability of developing the disease is higher in relatives of an affected person, with a greater risk among those more closely related.<ref name="pmid11955556"/> In [[identical twins]] both are affected about 30% of the time, while around 5% for non-identical twins and 2.5% of siblings are affected with a lower percentage of half-siblings.<ref name="pmid18970977"/><ref name="pmid11955556"/><ref>{{cite journal | vauthors = Hassan-Smith G, Douglas MR | title = Epidemiology and diagnosis of multiple sclerosis | journal = British Journal of Hospital Medicine | volume = 72 | issue = 10 | pages = M146-51 | date = October 2011 | pmid = 22041658 }}</ref> If both parents are affected the risk in their children is 10 times that of the general population.<ref name=Milo2010/> MS is also more common in some ethnic groups than others.<ref name="pmid11603614">{{cite journal | vauthors = Rosati G | title = The prevalence of multiple sclerosis in the world: an update | journal = Neurological Sciences | volume = 22 | issue = 2 | pages = 117–39 | date = April 2001 | pmid = 11603614 | doi = 10.1007/s100720170011 }}</ref>

Specific [[gene]]s that have been linked with MS include differences in the [[human leukocyte antigen]] (HLA) system—a group of genes on [[chromosome]] [[Chromosome 6 (human)|6]] that serves as the [[major histocompatibility complex]] (MHC).<ref name="pmid18970977"/> That changes in the HLA region are related to susceptibility has been known since the 1980s,<ref name="pmid21247752">{{cite journal | vauthors = Baranzini SE | title = Revealing the genetic basis of multiple sclerosis: are we there yet? | journal = Current Opinion in Genetics & Development | volume = 21 | issue = 3 | pages = 317–24 | date = June 2011 | pmid = 21247752 | pmc = 3105160 | doi = 10.1016/j.gde.2010.12.006 }}</ref> and additionally this same region has been implicated in the development of other autoimmune diseases such as [[diabetes type I]] and [[systemic lupus erythematosus]].<ref name="pmid21247752"/> The most consistent finding is the association between multiple sclerosis and [[allele]]s of the MHC defined as [[HLA-DR15|DR15]] and [[HLA-DQ6|DQ6]].<ref name="pmid18970977"/> Other loci have shown a protective effect, such as [[HLA-C554]] and [[HLA-DRB1]]*11.<ref name="pmid18970977"/> Overall, it has been estimated that HLA changes account for between 20 and 60% of the [[genetic predisposition]].<ref name="pmid21247752"/> Modern genetic methods ([[Genome-wide association study|genome-wide association studies]]) have discovered at least twelve other genes outside the HLA [[Locus (genetics)|locus]] that modestly increase the probability of MS.<ref name="pmid21247752"/>

===Infectious agents===
Many [[microbes]] have been proposed as triggers of MS, but none have been confirmed.<ref name="pmid11955556"/> Moving at an early age from one location in the world to another alters a person's subsequent risk of MS.<ref name="pmid17444504"/> An explanation for this could be that some kind of infection, produced by a widespread microbe rather than a rare one, is related to the disease.<ref name="pmid17444504"/> Proposed mechanisms include the [[hygiene hypothesis]] and the prevalence hypothesis. The hygiene hypothesis proposes that exposure to certain infectious agents early in life is protective, the disease is a response to a late encounter with such agents.<ref name="pmid18970977"/> The prevalence hypothesis proposes that the disease is due to an infectious agent more common in regions where MS is common and where, in most individuals, it causes an ongoing infection without symptoms. Only in a few cases and after many years does it cause demyelination.<ref name="pmid17444504"/><ref name="pmid8269393"/> The hygiene hypothesis has received more support than the prevalence hypothesis.<ref name="pmid17444504"/>

Evidence for a virus as a cause include the presence of [[oligoclonal bands]] in the brain and [[cerebrospinal fluid]] of most people with MS, the association of several viruses with human demyelination [[encephalomyelitis]], and the occurrence of demyelination in animals caused by some viral infections.<ref name="pmid15721830">{{cite journal | vauthors = Gilden DH | title = Infectious causes of multiple sclerosis | journal = The Lancet. Neurology | volume = 4 | issue = 3 | pages = 195–202 | date = March 2005 | pmid = 15721830 | doi = 10.1016/S1474-4422(05)01017-3 }}</ref> [[Human herpes virus]]es are a candidate group of viruses. Individuals having never been infected by the [[Epstein–Barr virus]] are at a reduced risk of getting MS, whereas those infected as young adults are at a greater risk than those having had it at a younger age.<ref name="pmid18970977"/><ref name="pmid17444504"/> Although some consider that this goes against the hygiene hypothesis, since the non-infected have probably experienced a more hygienic upbringing,<ref name="pmid17444504"/> others believe that there is no contradiction, since it is a first encounter with the causative virus relatively late in life that is the trigger for the disease.<ref name="pmid18970977"/> Other diseases that may be related include [[measles]], [[mumps]] and [[rubella]].<ref name="pmid18970977"/>

===Other===
[[Tobacco smoking|Smoking]] has been shown to be an independent risk factor for MS.<ref name="pmid17492755"/> [[Stress (biological)|Stress]] may be a risk factor although the evidence to support this is weak.<ref name="pmid15556803"/> Association with occupational exposures and [[toxin]]s—mainly [[solvent]]s—has been evaluated, but no clear conclusions have been reached.<ref name="pmid15556803"/> [[vaccine|Vaccin]]ations were studied as causal factors; however, most studies show no association.<ref name="pmid15556803"/> Several other possible risk factors, such as [[Diet (nutrition)|diet]] and [[hormone]] intake, have been looked at; however, evidence on their relation with the disease is "sparse and unpersuasive".<ref name="pmid17492755"/> [[Gout]] occurs less than would be expected and lower levels of [[uric acid]] have been found in people with MS. This has led to the theory that uric acid is protective, although its exact importance remains unknown.<ref name="pmid18219824">{{cite journal | vauthors = Spitsin S, Koprowski H | title = Role of uric acid in multiple sclerosis | journal = Current Topics in Microbiology and Immunology | volume = 318 | issue = | pages = 325–42 | year = 2008 | pmid = 18219824 | doi = 10.1007/978-3-540-73677-6_13 }}</ref>

==Pathophysiology==
{{Main|Pathophysiology of multiple sclerosis}}
[[File:Multiple Sclerosis.png|thumb|Multiple sclerosis]]
[[File:Nerve.nida.jpg|thumb|left|Nerve axon with myelin sheath]]
The three main characteristics of MS are the formation of lesions in the [[central nervous system]] (also called plaques), inflammation, and the destruction of [[myelin sheath]]s of neurons. These features interact in a complex and not yet fully understood manner to produce the breakdown of nerve tissue and in turn the signs and symptoms of the disease.<ref name="pmid18970977"/>
[[Cholesterol crystal]]s are believed to both impair myelin repair and aggravate inflammation.<ref name="pmid29439228">{{cite journal | vauthors=Chen Y, Popko B | title=Cholesterol crystals impede nerve repair | journal= [[Science (journal)|Science]] | volume=359 | issue=6376 | pages=635–635 | year=2018 | doi= 10.1126/science.aar7369 | PMID = 29439228 }}</ref><ref name="pmid29301957">{{cite journal | vauthors=Cantuti-Castelvetri L, Fitzner D, Bosch-Queralt M, Weil MT, Su M, Sen P, Ruhwedel T, Mitkovski M, Trendelenburg G, Lütjohann D, Möbius W, Simons M | title=Defective cholesterol clearance limits remyelination in the aged central nervous system | journal= [[Science (journal)|Science]] | volume=359 | issue=6376 | pages=684–688 | year=2018 | doi= 10.1126/science.aan4183 | PMID = 29301957 }}</ref> Additionally, MS is believed to be an [[Immune-mediated inflammatory diseases|immune-mediated]] disorder that develops from an interaction of the individual's genetics and as yet unidentified environmental causes.<ref name="pmid11955556"/> Damage is believed to be caused, at least in part, by attack on the nervous system by a person's own immune system.<ref name="pmid18970977"/>

===Lesions===
[[Image:MS Demyelinisation KB 10x.jpg|thumb|Demyelination in MS. On [[Klüver-Barrera]] myelin staining, decoloration in the area of the lesion can be appreciated ]]
The name ''multiple sclerosis'' refers to the scars (sclerae – better known as plaques or lesions) that form in the nervous system. These lesions most commonly affect the [[white matter]] in the [[optic nerve]], [[brain stem]], [[basal ganglia]], and [[spinal cord]], or white matter tracts close to the lateral [[Ventricular system|ventricles]].<ref name="pmid18970977"/> The function of white matter cells is to carry signals between [[grey matter]] areas, where the processing is done, and the rest of the body. The [[peripheral nervous system]] is rarely involved.<ref name="pmid11955556"/>

To be specific, MS involves the loss of [[oligodendrocyte]]s, the cells responsible for creating and maintaining a fatty layer—known as the [[myelin]] sheath—which helps the neurons carry [[Action potential|electrical signals]] (action potentials).<ref name="pmid18970977"/> This results in a thinning or complete loss of myelin and, as the disease advances, the breakdown of the [[axons]] of neurons. When the myelin is lost, a neuron can no longer effectively conduct electrical signals.<ref name="pmid11955556"/> A repair process, called [[remyelination]], takes place in early phases of the disease, but the oligodendrocytes are unable to completely rebuild the cell's myelin sheath.<ref name="pmid17531860">{{cite journal | vauthors = Chari DM | title = Remyelination in multiple sclerosis | journal = International Review of Neurobiology | volume = 79 | issue = | pages = 589–620 | year = 2007 | pmid = 17531860 | doi = 10.1016/S0074-7742(07)79026-8 }}</ref> Repeated attacks lead to successively less effective remyelinations, until a scar-like plaque is built up around the damaged axons.<ref name="pmid17531860"/> These scars are the origin of the symptoms and during an attack [[magnetic resonance imaging]] (MRI) often shows more than ten new plaques.<ref name="pmid18970977"/> This could indicate that there are a number of lesions below which the brain is capable of repairing itself without producing noticeable consequences.<ref name="pmid18970977"/> Another process involved in the creation of lesions is an abnormal [[astrocytosis|increase in the number of astrocytes]] due to the destruction of nearby neurons.<ref name="pmid18970977"/> A number of [[pathophysiology of multiple sclerosis#Demyelination patterns|lesion patterns]] have been described.<ref name="pmid17351524">{{cite journal | vauthors = Pittock SJ, Lucchinetti CF | title = The pathology of MS: new insights and potential clinical applications | journal = The Neurologist | volume = 13 | issue = 2 | pages = 45–56 | date = March 2007 | pmid = 17351524 | doi = 10.1097/01.nrl.0000253065.31662.37 }}</ref>

===Inflammation===
Apart from demyelination, the other sign of the disease is [[inflammation]]. Fitting with an [[immunological]] explanation, the inflammatory process is caused by [[T cell]]s, a kind of [[lymphocyte]] that plays an important role in the body's defenses.<ref name="pmid11955556"/> T cells gain entry into the brain via disruptions in the [[blood–brain barrier]]. The T cells recognize myelin as foreign and attack it, explaining why these cells are also called "autoreactive lymphocytes".<ref name="pmid18970977"/>

The attack of myelin starts inflammatory processes, which triggers other immune cells and the release of soluble factors like [[cytokine]]s and [[antibodies]]. A further breakdown of the blood-brain barrier, in turn, causes a number of other damaging effects such as [[oedema|swelling]], activation of [[macrophages]], and more activation of cytokines and other destructive proteins.<ref name="pmid11955556"/> Inflammation can potentially reduce transmission of information between neurons in at least three ways.<ref name="pmid18970977"/> The soluble factors released might stop neurotransmission by intact neurons. These factors could lead to or enhance the loss of myelin, or they may cause the axon to break down completely.<ref name="pmid18970977"/>

===Blood–brain barrier===
The [[blood–brain barrier]] (BBB) is a part of the [[capillary]] system that prevents the entry of T cells into the central nervous system.<!-- <ref name="pmid11955556"/> --> It may become permeable to these types of cells secondary to an infection by a virus or bacteria.<!-- <ref name="pmid11955556"/> --> After it repairs itself, typically once the infection has cleared, T cells may remain trapped inside the brain.<ref name="pmid11955556"/> [[Gadolinium]] cannot cross a normal BBB and, therefore, gadolinium-enhanced MRI is used to show BBB breakdowns.<ref name="pmid23088946">{{cite journal | vauthors = Ferré JC, Shiroishi MS, Law M | title = Advanced techniques using contrast media in neuroimaging | journal = Magnetic Resonance Imaging Clinics of North America | volume = 20 | issue = 4 | pages = 699–713 | date = November 2012 | pmid = 23088946 | pmc = 3479680 | doi = 10.1016/j.mric.2012.07.007 }}</ref>

==Diagnosis==
[[File:Monthly multiple sclerosis anim cropped no text.gif|thumb|Animation showing dissemination of brain lesions in time and space as demonstrated by monthly MRI studies along a year]][[File:MSMRIMark.png|thumb|Multiple sclerosis as seen on MRI]]
Multiple sclerosis is typically diagnosed based on the presenting signs and symptoms, in combination with supporting [[medical imaging]] and laboratory testing.<ref name=Tsang2011/> It can be difficult to confirm, especially early on, since the signs and symptoms may be similar to those of other medical problems.<ref name="pmid18970977"/><ref name="pmid11794488">{{cite journal | vauthors = Trojano M, Paolicelli D | title = The differential diagnosis of multiple sclerosis: classification and clinical features of relapsing and progressive neurological syndromes | journal = Neurological Sciences | volume = 22 Suppl 2 | issue = Suppl 2 | pages = S98-102 | date = November 2001 | pmid = 11794488 | doi = 10.1007/s100720100044 | url = http://link.springer-ny.com/link/service/journals/10072/bibs/122%20Suppl%202000/122%20Suppl%2020S98.htm }}{{dead link|date=September 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> The [[McDonald criteria]], which focus on clinical, laboratory, and radiologic evidence of lesions at different times and in different areas, is the most commonly used method of diagnosis<ref name=Atlas2008/> with the [[Schumacher criteria|Schumacher]] and [[Poser criteria]] being of mostly historical significance.<ref name="pmid15177763">{{cite journal | vauthors = Poser CM, Brinar VV | title = Diagnostic criteria for multiple sclerosis: an historical review | journal = Clinical Neurology and Neurosurgery | volume = 106 | issue = 3 | pages = 147–58 | date = June 2004 | pmid = 15177763 | doi = 10.1016/j.clineuro.2004.02.004 }}</ref>

Clinical data alone may be sufficient for a diagnosis of MS if an individual has had separate episodes of neurological symptoms characteristic of the disease.<ref name="pmid11456302"/> In those who seek medical attention after only one attack, other testing is needed for the diagnosis. The most commonly used diagnostic tools are [[neuroimaging]], analysis of cerebrospinal fluid and [[evoked potential]]s. [[Magnetic resonance imaging]] of the brain and spine may show areas of demyelination (lesions or plaques). [[Gadolinium]] can be administered [[intravenous]]ly as a [[contrast agent]] to highlight active plaques and, by elimination, demonstrate the existence of historical lesions not associated with symptoms at the moment of the evaluation.<ref name="pmid11456302"/><ref name="pmid18256986">{{cite journal | vauthors = Rashid W, Miller DH | title = Recent advances in neuroimaging of multiple sclerosis | journal = Seminars in Neurology | volume = 28 | issue = 1 | pages = 46–55 | date = February 2008 | pmid = 18256986 | doi = 10.1055/s-2007-1019127 }}</ref> Testing of cerebrospinal fluid obtained from a [[lumbar puncture]] can provide evidence of chronic [[inflammation]] in the central nervous system. The cerebrospinal fluid is tested for [[oligoclonal band]]s of IgG on [[electrophoresis]], which are inflammation markers found in 75–85% of people with MS.<ref name="pmid11456302"/><ref name="pmid16945427">{{cite journal | vauthors = Link H, Huang YM | title = Oligoclonal bands in multiple sclerosis cerebrospinal fluid: an update on methodology and clinical usefulness | journal = Journal of Neuroimmunology | volume = 180 | issue = 1–2 | pages = 17–28 | date = November 2006 | pmid = 16945427 | doi = 10.1016/j.jneuroim.2006.07.006 }}</ref> The nervous system in MS may respond less actively to stimulation of the [[optic nerve]] and [[sensory neuron|sensory nerves]] due to demyelination of such pathways. These brain responses can be examined using [[visual evoked potential|visual]]- and sensory-[[evoked potential]]s.<ref name="pmid10802774">{{cite journal | vauthors = Gronseth GS, Ashman EJ | title = Practice parameter: the usefulness of evoked potentials in identifying clinically silent lesions in patients with suspected multiple sclerosis (an evidence-based review): Report of the Quality Standards Subcommittee of the American Academy of Neurology | journal = Neurology | volume = 54 | issue = 9 | pages = 1720–5 | date = May 2000 | pmid = 10802774 | doi = 10.1212/WNL.54.9.1720 }}</ref>

While the above criteria allow for a non-invasive diagnosis, and even though some state<ref name="pmid18970977"/> that the only definitive proof is an [[autopsy]] or [[biopsy]] where lesions typical of MS are detected,<ref name="pmid11456302">{{cite journal | vauthors = McDonald WI, Compston A, Edan G, Goodkin D, Hartung HP, Lublin FD, McFarland HF, Paty DW, Polman CH, Reingold SC, Sandberg-Wollheim M, Sibley W, Thompson A, van den Noort S, Weinshenker BY, Wolinsky JS | author1-link=W. Ian McDonald | author16-link=Jerry Wolinsky | title = Recommended diagnostic criteria for multiple sclerosis: guidelines from the International Panel on the diagnosis of multiple sclerosis | journal = Annals of Neurology | volume = 50 | issue = 1 | pages = 121–7 | date = July 2001 | pmid = 11456302 | doi = 10.1002/ana.1032 }}</ref><ref name="pmid16283615">{{cite journal | vauthors = Polman CH, Reingold SC, Edan G, Filippi M, Hartung HP, Kappos L, Lublin FD, Metz LM, McFarland HF, O'Connor PW, Sandberg-Wollheim M, Thompson AJ, Weinshenker BG, Wolinsky JS | title = Diagnostic criteria for multiple sclerosis: 2005 revisions to the "McDonald Criteria" | journal = Annals of Neurology | volume = 58 | issue = 6 | pages = 840–6 | date = December 2005 | pmid = 16283615 | doi = 10.1002/ana.20703 }}</ref> currently, as of 2017, there is no single test (including biopsy) that can provide a definitive diagnosis of this disease.<ref>{{cite journal | vauthors = Rovira À | title = Diagnosis of Multiple Sclerosis. | journal = Journal of the Belgian Society of Radiology | volume = 101(S1)| pages = 12 | date = November 2017 | doi = 10.5334/jbr-btr.1426}}</ref>

==Types==
Several [[Phenotype (clinical medicine)|phenotypes]] (commonly termed ''types''), or patterns of progression, have been described. Phenotypes use the past course of the disease in an attempt to predict the future course. They are important not only for prognosis but also for treatment decisions. Currently, the United States [[National Multiple Sclerosis Society]] and the [[Multiple Sclerosis International Federation]], describes four types of MS (revised in 2013):<ref name="NMSS-types-2013-vs-1996">{{cite web| url = http://www.nationalmssociety.org/NationalMSSociety/media/MSNational/Charts-Graphics/new_MSdiseasecourses_table.pdf| title = Changes in multiple sclerosis disease-course (or "type") descriptions| access-date = 21 August 2017| author = [[National Multiple Sclerosis Society]]| quote = NEW COURSE ADDED: Clinically Isolated Syndrome (CIS)...COURSE ELIMINATED: Progressive Relapsing (PRMS).| deadurl = no| archive-url = https://web.archive.org/web/20160803214243/http://www.nationalmssociety.org/NationalMSSociety/media/MSNational/Charts-Graphics/new_MSdiseasecourses_table.pdf| archive-date = 3 August 2016| df = dmy-all}}</ref><ref name=Lublin>{{cite web| url = http://www.neurology.org/content/83/3/278.full | title = Defining the clinical course of multiple sclerosis, The 2013 revisions |vauthors=Lublin FD, etal | date = 15 July 2014| doi = 10.1212/WNL.0000000000000560}}</ref><ref name="NMSS-types">{{cite web| url = http://www.nationalmssociety.org/What-is-MS/Types-of-MS| title = Types of MS| access-date = 21 August 2017| author = [[National Multiple Sclerosis Society]]| quote = Four disease courses have been identified in multiple sclerosis: clinically isolated syndrome (CIS), relapsing-remitting MS (RRMS), primary progressive MS (PPMS), and secondary progressive MS (SPMS).| deadurl = no| archive-url = https://web.archive.org/web/20170707222351/https://www.nationalmssociety.org/What-is-MS/Types-of-MS| archive-date = 7 July 2017| df = dmy-all}}</ref>

# Clinically isolated syndrome (CIS)
# Relapsing-remitting MS (RRMS)
# Primary progressive MS (PPMS)
# Secondary progressive MS (SPMS)

Relapsing-remitting MS is characterized by unpredictable relapses followed by periods of months to years of relative quiet ([[remission (medicine)|remission]]) with no new signs of disease activity. Deficits that occur during attacks may either resolve or leave [[sequelae|problems]], the latter in about 40% of attacks and being more common the longer a person has had the disease.<ref name="pmid18970977"/><ref name=Tsang2011/> This describes the initial course of 80% of individuals with MS.<ref name="pmid18970977"/> When deficits always resolve between attacks, this is sometimes referred to as ''benign MS'',<ref name="pmid18219812">{{cite journal | vauthors = Pittock SJ, Rodriguez M | title = Benign multiple sclerosis: a distinct clinical entity with therapeutic implications | journal = Current Topics in Microbiology and Immunology | volume = 318 | issue = | pages = 1–17 | year = 2008 | pmid = 18219812 | doi = 10.1007/978-3-540-73677-6_1 | isbn = 978-3-540-73676-9 | series = Current Topics in Microbiology and Immunology }}</ref> although people will still build up some degree of disability in the long term.<ref name="pmid18970977"/> On the other hand, the term ''[[malignant multiple sclerosis]]'' is used to describe people with MS having reached significant level of disability in a short period.<ref>{{cite book|author=Feinstein A|title=The clinical neuropsychiatry of multiple sclerosis|year=2007|publisher=Cambridge University Press|location=Cambridge|isbn=052185234X|page=20|edition=2nd}}</ref> The relapsing-remitting subtype usually begins with a clinically isolated syndrome (CIS). In CIS, a person has an attack suggestive of demyelination, but does not fulfill the criteria for multiple sclerosis.<ref name="pmid18970977"/><ref name="pmid15847841">{{cite journal | vauthors = Miller D, Barkhof F, Montalban X, Thompson A, Filippi M | title = Clinically isolated syndromes suggestive of multiple sclerosis, part I: natural history, pathogenesis, diagnosis, and prognosis | journal = The Lancet. Neurology | volume = 4 | issue = 5 | pages = 281–8 | date = May 2005 | pmid = 15847841 | doi = 10.1016/S1474-4422(05)70071-5 }}</ref> 30 to 70% of persons experiencing CIS later develop MS.<ref name="pmid15847841"/>

Primary progressive MS occurs in approximately 10–20% of individuals, with no remission after the initial symptoms.<ref name=Tsang2011/><ref name="pmid17884680">{{cite journal | vauthors = Miller DH, Leary SM | title = Primary-progressive multiple sclerosis | journal = The Lancet. Neurology | volume = 6 | issue = 10 | pages = 903–12 | date = October 2007 | pmid = 17884680 | doi = 10.1016/S1474-4422(07)70243-0 }}</ref> It is characterized by progression of disability from onset, with no, or only occasional and minor, remissions and improvements.<ref name="pmid8780061"/> The usual age of onset for the primary progressive subtype is later than of the relapsing-remitting subtype. It is similar to the age that secondary progressive usually begins in relapsing-remitting MS, around 40 years of age.<ref name="pmid18970977"/>

Secondary progressive MS occurs in around 65% of those with initial relapsing-remitting MS, who eventually have progressive neurologic decline between acute attacks without any definite periods of remission.<ref name="pmid18970977"/><ref name="pmid8780061"/> Occasional relapses and minor remissions may appear.<ref name="pmid8780061"/> The most common length of time between disease onset and conversion from relapsing-remitting to secondary progressive MS is 19&nbsp;years.<ref name="pmid16545751">{{cite journal | vauthors = Rovaris M, Confavreux C, Furlan R, Kappos L, Comi G, Filippi M | title = Secondary progressive multiple sclerosis: current knowledge and future challenges | journal = The Lancet. Neurology | volume = 5 | issue = 4 | pages = 343–54 | date = April 2006 | pmid = 16545751 | doi = 10.1016/S1474-4422(06)70410-0 }}</ref>

[[Idiopathic inflammatory demyelinating diseases|Other, unusual types of MS]] have been described; these include [[Devic's disease]], [[Balo concentric sclerosis]], [[Diffuse myelinoclastic sclerosis|Schilder's diffuse sclerosis]], and [[Marburg multiple sclerosis]]. There is debate on whether they are MS variants or different diseases.<ref name="pmid15727225">{{cite journal | vauthors = Stadelmann C, Brück W | title = Lessons from the neuropathology of atypical forms of multiple sclerosis | journal = Neurological Sciences | volume = 25 Suppl 4 | issue = Suppl 4 | pages = S319-22 | date = November 2004 | pmid = 15727225 | doi = 10.1007/s10072-004-0333-1 }}</ref> Multiple sclerosis behaves differently in children, taking more time to reach the progressive stage.<ref name="pmid18970977"/> Nevertheless, they still reach it at a lower average age than adults usually do.<ref name="pmid18970977"/>

==Management==
{{Main|Management of multiple sclerosis}}

Although there is no known cure for multiple sclerosis, several therapies have proven helpful. The primary aims of therapy are returning function after an attack, preventing new attacks, and preventing disability. Starting medications is generally recommended in people after the first attack when more than two lesions are seen on MRI.<ref name=Neurology2018>{{cite journal|last1=Rae-Grant|first1=Alexander|last2=Day|first2=Gregory S.|last3=Marrie|first3=Ruth Ann|last4=Rabinstein|first4=Alejandro|last5=Cree|first5=Bruce A.C.|last6=Gronseth|first6=Gary S.|last7=Haboubi|first7=Michael|last8=Halper|first8=June|last9=Hosey|first9=Jonathan P.|last10=Jones|first10=David E.|last11=Lisak|first11=Robert|last12=Pelletier|first12=Daniel|last13=Potrebic|first13=Sonja|last14=Sitcov|first14=Cynthia|last15=Sommers|first15=Rick|last16=Stachowiak|first16=Julie|last17=Getchius|first17=Thomas S.D.|last18=Merillat|first18=Shannon A.|last19=Pringsheim|first19=Tamara|title=Practice guideline recommendations summary: Disease-modifying therapies for adults with multiple sclerosis|journal=Neurology|date=23 April 2018|volume=90|issue=17|pages=777–788|doi=10.1212/WNL.0000000000005347}}</ref>

As with any medical treatment, medications used in the management of MS have several [[adverse effect (medicine)|adverse effects]]. [[Alternative medicine|Alternative treatments]] are pursued by some people, despite the shortage of supporting evidence.

===Acute attacks===
During symptomatic attacks, administration of high doses of [[intravenous therapy|intravenous]] [[corticosteroid]]s, such as [[methylprednisolone]], is the usual therapy,<ref name="pmid18970977"/> with oral corticosteroids seeming to have a similar efficacy and safety profile.<ref>{{cite journal | vauthors = Burton JM, O'Connor PW, Hohol M, Beyene J | title = Oral versus intravenous steroids for treatment of relapses in multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | volume = 12 | pages = CD006921 | date = December 2012 | pmid = 23235634 | doi = 10.1002/14651858.CD006921.pub3 }}</ref> Although, in general, effective in the short term for relieving symptoms, corticosteroid treatments do not appear to have a significant impact on long-term recovery.<ref name="RCOP_acute">{{cite book|author=The National Collaborating Centre for Chronic Conditions|title=Multiple sclerosis : national clinical guideline for diagnosis and management in primary and secondary care|year=2004|publisher=Royal College of Physicians|location=London|isbn=1-86016-182-0|pages=54–57|url=https://www.ncbi.nlm.nih.gov/books/NBK48919/pdf/TOC.pdf|access-date=6 February 2013|format=pdf|pmid=21290636}}</ref> The consequences of severe attacks that do not respond to corticosteroids might be treatable by [[plasmapheresis]].<ref name="pmid18970977"/>

===Disease-modifying treatments===

====Relapsing remitting multiple sclerosis====
As of 2017, ten disease-modifying medications are approved by regulatory agencies for relapsing-remitting multiple sclerosis (RRMS). They are [[interferon beta-1a]], [[interferon beta-1b]], [[glatiramer acetate]], [[mitoxantrone]], [[natalizumab]], [[fingolimod]], [[teriflunomide]],<ref name=He2016>{{cite journal | vauthors = He D, Zhang C, Zhao X, Zhang Y, Dai Q, Li Y, Chu L | title = Teriflunomide for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | volume = 3 | pages = CD009882 | date = March 2016 | pmid = 27003123 | doi = 10.1002/14651858.CD009882.pub3 }}</ref><ref name="Aubagio">{{cite press release|title=FDA approves new multiple sclerosis treatment Aubagio|date=12 September 2012|publisher=US FDA|url=https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&applno=202992|access-date=22 September 2017|deadurl=yes|archive-url=https://web.archive.org/web/20170130222628/http://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&ApplNo=202992|archive-date=30 January 2017}}</ref> [[dimethyl fumarate]],<ref name=fumarate>{{cite press release|url=http://www.biogenidec.com/press_release_details.aspx?ID=5981&ReqId=1801165|title=Biogen Idec’s TECFIDERA™ (Dimethyl Fumarate) Approved in US as a First-Line Oral Treatment for Multiple Sclerosis|publisher=Biogen Idec|date=27 March 2013|access-date=4 June 2013|deadurl=yes|archive-url=https://web.archive.org/web/20130512021453/http://www.biogenidec.com/press_release_details.aspx?ID=5981&ReqId=1801165|archive-date=12 May 2013}}</ref> [[alemtuzumab]],<ref>{{cite news|title=FDA Approves Lemtrada|url=https://www.drugs.com/newdrugs/fda-approves-lemtrada-alemtuzumab-relapsing-forms-multiple-sclerosis-4110.html|date=14 November 2013|agency=Biogen Idec Press Release|deadurl=no|archive-url=https://web.archive.org/web/20141119014548/http://www.drugs.com/newdrugs/fda-approves-lemtrada-alemtuzumab-relapsing-forms-multiple-sclerosis-4110.html|archive-date=19 November 2014}}</ref><ref>{{cite journal | vauthors = Riera R, Porfírio GJ, Torloni MR | title = Alemtuzumab for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | volume = 4 | pages = CD011203 | date = April 2016 | pmid = 27082500 | doi = 10.1002/14651858.CD011203.pub2 }}</ref> and [[ocrelizumab]].<ref>{{cite news|title=FDA Ocrevus approval|url=https://www.fda.gov/newsevents/newsroom/pressannouncements/ucm549325.htm|date=29 March 2017|agency=FDA Press Release|deadurl=no|archive-url=https://web.archive.org/web/20170403185536/https://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm549325.htm|archive-date=3 April 2017}}</ref>

Their cost effectiveness as of 2012 is unclear.<ref>{{cite journal | vauthors = Manouchehrinia A, Constantinescu CS | title = Cost-effectiveness of disease-modifying therapies in multiple sclerosis | journal = Current Neurology and Neuroscience Reports | volume = 12 | issue = 5 | pages = 592–600 | date = October 2012 | pmid = 22782520 | doi = 10.1007/s11910-012-0291-6 }}</ref> In March 2017 the FDA approved [[ocrelizumab]], a [[Humanized antibody|humanized]] anti-[[CD20]] [[monoclonal antibody]], as a treatment for RRMS,<ref name=STATapproval>{{cite news |title=After 40-year odyssey, first drug for aggressive MS wins FDA approval |url=https://www.statnews.com/2017/03/28/multiple-sclerosis-ms-drug-ocrelizumab/ |date=28 March 2017 |author=Ron Winslow |publisher=STAT |deadurl=no |archive-url=https://web.archive.org/web/20170401151407/https://www.statnews.com/2017/03/28/multiple-sclerosis-ms-drug-ocrelizumab/ |archive-date=1 April 2017 }}</ref><ref name=FDAlabel2017>{{cite web|title=Ocrelizumab label|url=https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/761053lbl.pdf|publisher=FDA|access-date=1 April 2017|date=March 2017|deadurl=no|archive-url=https://web.archive.org/web/20170401232405/https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/761053lbl.pdf|archive-date=1 April 2017}} See [http://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&varApplNo=761053 FDA index page for BLA 761053] {{webarchive|url=https://web.archive.org/web/20170401233016/https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&varApplNo=761053 |date=1 April 2017 }} for updates.</ref> with requirements for several [[Phases of clinical research#Phase IV|Phase IV]] clinical trials.<ref name=FDABLAapproval>{{cite web|title=BLA Approval Letter|url=https://www.accessdata.fda.gov/drugsatfda_docs/appletter/2017/761053Orig1s000ltr.pdf|publisher=FDA|date=28 March 2017|deadurl=no|archive-url=https://web.archive.org/web/20170402081250/https://www.accessdata.fda.gov/drugsatfda_docs/appletter/2017/761053Orig1s000ltr.pdf|archive-date=2 April 2017}}</ref>

In RRMS they are modestly effective at decreasing the number of attacks.<ref name=He2016 /> The interferons and glatiramer acetate are first-line treatments<ref name=Tsang2011/> and are roughly equivalent, reducing relapses by approximately 30%.<ref name=Hassan2011>{{cite journal | vauthors = Hassan-Smith G, Douglas MR | title = Management and prognosis of multiple sclerosis | journal = British Journal of Hospital Medicine | volume = 72 | issue = 11 | pages = M174-6 | date = November 2011 | pmid = 22082979 }}</ref> Early-initiated long-term therapy is safe and improves outcomes.<ref name="pmid21205679">{{cite journal | vauthors = Freedman MS | title = Long-term follow-up of clinical trials of multiple sclerosis therapies | journal = Neurology | volume = 76 | issue = 1 Suppl 1 | pages = S26-34 | date = January 2011 | pmid = 21205679 | doi = 10.1212/WNL.0b013e318205051d }}</ref><ref name="pmid22284996">{{cite journal | vauthors = Qizilbash N, Mendez I, Sanchez-de la Rosa R | title = Benefit-risk analysis of glatiramer acetate for relapsing-remitting and clinically isolated syndrome multiple sclerosis | journal = Clinical Therapeutics | volume = 34 | issue = 1 | pages = 159–176.e5 | date = January 2012 | pmid = 22284996 | doi = 10.1016/j.clinthera.2011.12.006 }}</ref> Natalizumab reduces the relapse rate more than first-line agents; however, due to issues of adverse effects is a second-line agent reserved for those who do not respond to other treatments<ref name=Tsang2011/> or with severe disease.<ref name=Hassan2011/> Mitoxantrone, whose use is limited by severe adverse effects, is a third-line option for those who do not respond to other medications.<ref name=Tsang2011/> Treatment of clinically isolated syndrome (CIS) with [[interferon]]s decreases the chance of progressing to clinical MS.<ref name="pmid18970977"/><ref name="pmid21205678">{{cite journal | vauthors = Bates D | title = Treatment effects of immunomodulatory therapies at different stages of multiple sclerosis in short-term trials | journal = Neurology | volume = 76 | issue = 1 Suppl 1 | pages = S14-25 | date = January 2011 | pmid = 21205678 | doi = 10.1212/WNL.0b013e3182050388 }}</ref> Efficacy of interferons and glatiramer acetate in children has been estimated to be roughly equivalent to that of adults.<ref name="pmid22642799">{{cite journal | vauthors = Johnston J, So TY | title = First-line disease-modifying therapies in paediatric multiple sclerosis: a comprehensive overview | journal = Drugs | volume = 72 | issue = 9 | pages = 1195–211 | date = June 2012 | pmid = 22642799 | doi = 10.2165/11634010-000000000-00000 }}</ref> The role of some newer agents such as fingolimod, teriflunomide, and dimethyl fumarate, as of 2011, is not yet entirely clear.<ref name="pmid22014437"/>

As of 2017, [[rituximab]] was widely used off-label to treat RRMS.<ref name=McGinley2017rev>{{cite journal | vauthors = McGinley MP, Moss BP, Cohen JA | title = Safety of monoclonal antibodies for the treatment of multiple sclerosis | journal = Expert Opinion on Drug Safety | volume = 16 | issue = 1 | pages = 89–100 | date = January 2017 | pmid = 27756172 | doi = 10.1080/14740338.2017.1250881 }}</ref>

====Progressive multiple sclerosis====
As of 2017, rituximab has been widely used off-label to treat progressive primary MS.<ref name=McGinley2017rev/> In March 2017 the FDA approved ocrelizumab as a treatment for primary progressive MS, the first drug to gain that approval,<ref name=STATapproval>{{cite news |title=After 40-year odyssey, first drug for aggressive MS wins FDA approval |url=https://www.statnews.com/2017/03/28/multiple-sclerosis-ms-drug-ocrelizumab/ |date=28 March 2017 |author=Ron Winslow |publisher=STAT |deadurl=no |archive-url=https://web.archive.org/web/20170401151407/https://www.statnews.com/2017/03/28/multiple-sclerosis-ms-drug-ocrelizumab/ |archive-date=1 April 2017 }}</ref><ref name=FDAlabel2017>{{cite web|title=Ocrelizumab label|url=https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/761053lbl.pdf|publisher=FDA|access-date=1 April 2017|date=March 2017|deadurl=no|archive-url=https://web.archive.org/web/20170401232405/https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/761053lbl.pdf|archive-date=1 April 2017}} See [http://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&varApplNo=761053 FDA index page for BLA 761053] {{webarchive|url=https://web.archive.org/web/20170401233016/https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&varApplNo=761053 |date=1 April 2017 }} for updates.</ref> with requirements for several [[Phases of clinical research#Phase IV|Phase IV]] clinical trials.<ref name=FDABLAapproval>{{cite web|title=BLA Approval Letter|url=https://www.accessdata.fda.gov/drugsatfda_docs/appletter/2017/761053Orig1s000ltr.pdf|publisher=FDA|date=28 March 2017|deadurl=no|archive-url=https://web.archive.org/web/20170402081250/https://www.accessdata.fda.gov/drugsatfda_docs/appletter/2017/761053Orig1s000ltr.pdf|archive-date=2 April 2017}}</ref>

{{As of|2011}}, only one medication, mitoxantrone, has been approved for secondary progressive MS.<ref name="BopeKellerman2011">{{cite book|author1=Edward T. Bope|author2=Rick D. Kellerman|title=Conn's Current Therapy 2012: Expert Consult – Online and Print|url=https://books.google.com/books?id=pyKjGU5JdqQC&pg=PT662|date=22 December 2011|publisher=Elsevier Health Sciences|isbn=1-4557-0738-4|pages=662– }}</ref> In this population tentative evidence supports mitoxantrone moderately slowing the progression of the disease and decreasing rates of relapses over two years.<ref name=CochMit2013>{{cite journal | vauthors = Martinelli Boneschi F, Vacchi L, Rovaris M, Capra R, Comi G | title = Mitoxantrone for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | volume = 5 | issue = 5 | pages = CD002127 | date = May 2013 | pmid = 23728638 | doi = 10.1002/14651858.CD002127.pub3 }}</ref><ref>{{cite journal | vauthors = Marriott JJ, Miyasaki JM, Gronseth G, O'Connor PW | title = Evidence Report: The efficacy and safety of mitoxantrone (Novantrone) in the treatment of multiple sclerosis: Report of the Therapeutics and Technology Assessment Subcommittee of the American Academy of Neurology | journal = Neurology | volume = 74 | issue = 18 | pages = 1463–70 | date = May 2010 | pmid = 20439849 | pmc = 2871006 | doi = 10.1212/WNL.0b013e3181dc1ae0 }}</ref>

====Adverse effects====
[[File:Copaxone Injection Site Reaction.JPG|thumb|Irritation zone after injection of glatiramer acetate.]]
The disease-modifying treatments have several adverse effects. One of the most common is irritation at the injection site for glatiramer acetate and the interferons (up to 90% with subcutaneous injections and 33% with intramuscular injections).<ref name=Balak2012>{{cite journal | vauthors = Balak DM, Hengstman GJ, Çakmak A, Thio HB | title = Cutaneous adverse events associated with disease-modifying treatment in multiple sclerosis: a systematic review | journal = Multiple Sclerosis | volume = 18 | issue = 12 | pages = 1705–17 | date = December 2012 | pmid = 22371220 | doi = 10.1177/1352458512438239 }}</ref> Over time, a visible dent at the injection site, due to the local destruction of fat tissue, known as [[lipoatrophy]], may develop.<ref name=Balak2012/> Interferons may produce [[flu-like symptoms]];<ref name="pmid17131933">{{cite journal | vauthors = Sládková T, Kostolanský F | title = The role of cytokines in the immune response to influenza A virus infection | journal = Acta Virologica | volume = 50 | issue = 3 | pages = 151–62 | year = 2006 | pmid = 17131933 }}</ref> some people taking glatiramer experience a post-injection reaction with flushing, chest tightness, heart palpitations, and anxiety, which usually lasts less than thirty minutes.<ref>{{cite journal | vauthors = La Mantia L, Munari LM, Lovati R | title = Glatiramer acetate for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | issue = 5 | pages = CD004678 | date = May 2010 | pmid = 20464733 | doi = 10.1002/14651858.CD004678.pub2 }}</ref> More dangerous but much less common are [[hepatotoxicity|liver damage]] from interferons,<ref name="pmid15592724">{{cite journal | vauthors = Tremlett H, Oger J | title = Hepatic injury, liver monitoring and the beta-interferons for multiple sclerosis | journal = Journal of Neurology | volume = 251 | issue = 11 | pages = 1297–303 | date = November 2004 | pmid = 15592724 | doi = 10.1007/s00415-004-0619-5 }}</ref> [[systolic dysfunction]] (12%), [[infertility]], and [[acute myeloid leukemia]] (0.8%) from mitoxantrone,<ref name=CochMit2013/><ref name="pmid19882365">{{cite journal | vauthors = Comi G | title = Treatment of multiple sclerosis: role of natalizumab | journal = Neurological Sciences | volume = 30 Suppl 2 | issue = S2 | pages = S155-8 | date = October 2009 | pmid = 19882365 | doi = 10.1007/s10072-009-0147-2 | series = 30 }}</ref> and [[progressive multifocal leukoencephalopathy]] occurring with natalizumab (occurring in 1 in 600 people treated).<ref name=Tsang2011/><ref>{{cite journal | vauthors = Hunt D, Giovannoni G | title = Natalizumab-associated progressive multifocal leucoencephalopathy: a practical approach to risk profiling and monitoring | journal = Practical Neurology | volume = 12 | issue = 1 | pages = 25–35 | date = February 2012 | pmid = 22258169 | doi = 10.1136/practneurol-2011-000092 }}</ref>

Fingolimod may give rise to [[hypertension]] and [[bradycardia|slowed heart rate]], [[macular edema]], elevated liver enzymes or a [[lymphopenia|reduction in lymphocyte levels]].<ref name="pmid22014437">{{cite journal | vauthors = Killestein J, Rudick RA, Polman CH | title = Oral treatment for multiple sclerosis | journal = The Lancet. Neurology | volume = 10 | issue = 11 | pages = 1026–34 | date = November 2011 | pmid = 22014437 | doi = 10.1016/S1474-4422(11)70228-9 }}</ref> Tentative evidence supports the short-term safety of teriflunomide, with common side effects including: headaches, fatigue, nausea, hair loss, and limb pain.<ref name=He2016 /> There have also been reports of liver failure and PML with its use and it is [[Teratology|dangerous for fetal development]].<ref name="pmid22014437"/> Most common side effects of dimethyl fumarate are flushing and gastrointestinal problems.<ref name=fumarate/><ref name="pmid22014437"/> While dimethyl fumarate may lead to a [[neutropenia|reduction in the white blood cell count]] there were no reported cases of opportunistic infections during trials.<ref name=fumarateNDA>{{cite web |title=NDA 204063 – FDA Approved Labeling Text |url=http://www.accessdata.fda.gov/drugsatfda_docs/label/2013/204063lbl.pdf |date=27 March 2013 |access-date=5 April 2013 |publisher=US Food and Drug Agency |deadurl=no |archive-url=https://web.archive.org/web/20131004220910/http://www.accessdata.fda.gov/drugsatfda_docs/label/2013/204063lbl.pdf |archive-date=4 October 2013 }}<br>{{cite web |title=NDA Approval |date=27 March 2013 |url=http://www.accessdata.fda.gov/drugsatfda_docs/appletter/2013/204063Orig1s000ltr.pdf |access-date=5 April 2013 |publisher=US Food and Drug Agency |deadurl=no |archive-url=https://web.archive.org/web/20131004220451/http://www.accessdata.fda.gov/drugsatfda_docs/appletter/2013/204063Orig1s000ltr.pdf |archive-date=4 October 2013 }}</ref><ref name="pmid22224673"/>

===Associated symptoms===
Both medications and [[neurorehabilitation]] have been shown to improve some symptoms, though neither changes the course of the disease.<ref name="pmid16168933">{{cite journal | vauthors = Kesselring J, Beer S | title = Symptomatic therapy and neurorehabilitation in multiple sclerosis | journal = The Lancet. Neurology | volume = 4 | issue = 10 | pages = 643–52 | date = October 2005 | pmid = 16168933 | doi = 10.1016/S1474-4422(05)70193-9 }}</ref> Some symptoms have a good response to medication, such as an unstable bladder and spasticity, while others are little changed.<ref name="pmid18970977"/> For neurologic problems, a [[multidisciplinary]] approach is important for improving quality of life; however, it is difficult to specify a 'core team' as many health services may be needed at different points in time.<ref name="pmid18970977"/> Multidisciplinary rehabilitation programs increase activity and participation of people with MS but do not influence impairment level.<ref name="pmid17443610">{{cite journal | vauthors = Khan F, Turner-Stokes L, Ng L, Kilpatrick T | title = Multidisciplinary rehabilitation for adults with multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | issue = 2 | pages = CD006036 | date = April 2007 | pmid = 17443610 | doi = 10.1002/14651858.CD006036.pub2 | editor1-last = Khan | editor1-first = Fary }}</ref> There is limited evidence for the overall efficacy of individual therapeutic disciplines,<ref name="pmid15859525">{{cite journal | vauthors = Steultjens EM, Dekker J, Bouter LM, Leemrijse CJ, van den Ende CH | title = Evidence of the efficacy of occupational therapy in different conditions: an overview of systematic reviews | journal = Clinical Rehabilitation | volume = 19 | issue = 3 | pages = 247–54 | date = May 2005 | pmid = 15859525 | doi = 10.1191/0269215505cr870oa }}</ref><ref name="pmid12917976">{{cite journal | vauthors = Steultjens EM, Dekker J, Bouter LM, Cardol M, Van de Nes JC, Van den Ende CH | title = Occupational therapy for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | volume = | issue = 3 | pages = CD003608 | year = 2003 | pmid = 12917976 | doi = 10.1002/14651858.CD003608 | editor1-last = Steultjens | editor1-first = Esther EMJ }}</ref> though there is good evidence that specific approaches, such as exercise,<ref name="pmid17482708">{{cite journal | vauthors = Gallien P, Nicolas B, Robineau S, Pétrilli S, Houedakor J, Durufle A | title = Physical training and multiple sclerosis | journal = Annales De Readaptation Et De Medecine Physique | volume = 50 | issue = 6 | pages = 373–6, 369–72 | date = July 2007 | pmid = 17482708 | doi = 10.1016/j.annrmp.2007.04.004 }}</ref><ref>{{cite journal | vauthors = Rietberg MB, Brooks D, Uitdehaag BM, Kwakkel G | title = Exercise therapy for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | issue = 1 | pages = CD003980 | date = January 2005 | pmid = 15674920 | doi = 10.1002/14651858.CD003980.pub2 | editor1-last = Kwakkel | editor1-first = Gert }}</ref> and psychological therapies are effective.<ref>{{cite journal | vauthors = Thomas PW, Thomas S, Hillier C, Galvin K, Baker R | title = Psychological interventions for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | issue = 1 | pages = CD004431 | date = January 2006 | pmid = 16437487 | doi = 10.1002/14651858.CD004431.pub2 | editor1-last = Thomas | editor1-first = Peter W }}</ref> [[Cognitive behavioral therapy]] has shown to be moderately effective for reducing MS fatigue.<ref>{{cite journal |last1=van den Akker |first1=Lizanne Eva |last2=Beckerman |first2=Heleen |last3=Collette |first3=Emma Hubertine |last4=Eijssen |first4=Isaline Catharine Josephine Maria |last5=Dekker |first5=Joost |last6=de Groot |first6=Vincent |title=Effectiveness of cognitive behavioral therapy for the treatment of fatigue in patients with multiple sclerosis: A systematic review and meta-analysis |journal=Journal of Psychosomatic Research |date=November 2016 |volume=90 |pages=33–42 |doi=10.1016/j.jpsychores.2016.09.002}}</ref>

===Alternative treatments===
Over 50% of people with MS may use [[complementary and alternative medicine]], although percentages vary depending on how alternative medicine is defined.<ref name="pmid16420779"/> The evidence for the effectiveness for such treatments in most cases is weak or absent.<ref name="pmid16420779"/><ref name="pmid19222053">{{cite journal | vauthors = Olsen SA | title = A review of complementary and alternative medicine (CAM) by people with multiple sclerosis | journal = Occupational Therapy International | volume = 16 | issue = 1 | pages = 57–70 | year = 2009 | pmid = 19222053 | doi = 10.1002/oti.266 }}</ref> Treatments of unproven benefit used by people with MS include dietary supplementation and regimens,<ref name="pmid16420779"/><ref>{{cite journal | vauthors = Farinotti M, Vacchi L, Simi S, Di Pietrantonj C, Brait L, Filippini G | title = Dietary interventions for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | volume = 12 | pages = CD004192 | date = December 2012 | pmid = 23235605 | doi = 10.1002/14651858.CD004192.pub3 }}</ref><ref name="pmid21965673">{{cite journal | vauthors = Grigorian A, Araujo L, Naidu NN, Place DJ, Choudhury B, Demetriou M | title = N-acetylglucosamine inhibits T-helper 1 (Th1)/T-helper 17 (Th17) cell responses and treats experimental autoimmune encephalomyelitis | journal = The Journal of Biological Chemistry | volume = 286 | issue = 46 | pages = 40133–41 | date = November 2011 | pmid = 21965673 | pmc = 3220534 | doi = 10.1074/jbc.M111.277814 }}</ref> vitamin D,<ref>{{cite journal | vauthors = Pozuelo-Moyano B, Benito-León J, Mitchell AJ, Hernández-Gallego J | title = A systematic review of randomized, double-blind, placebo-controlled trials examining the clinical efficacy of vitamin D in multiple sclerosis | journal = Neuroepidemiology | volume = 40 | issue = 3 | pages = 147–53 | year = 2013 | pmid = 23257784 | pmc = 3649517 | doi = 10.1159/000345122 | type = Systematic review | quote = the available evidence substantiates neither clinically significant benefit nor harm from vitamin D in the treatment of patients with MS }}</ref> [[relaxation technique]]s such as [[yoga]],<ref name="pmid16420779"/> [[herbal medicine]] (including [[medical cannabis]]),<ref name="pmid16420779"/><ref>{{cite journal | vauthors = Chong MS, Wolff K, Wise K, Tanton C, Winstock A, Silber E | title = Cannabis use in patients with multiple sclerosis | journal = Multiple Sclerosis | volume = 12 | issue = 5 | pages = 646–51 | date = October 2006 | pmid = 17086912 | doi = 10.1177/1352458506070947 }}</ref><ref>{{cite journal |title=Assessment of Efficacy and Tolerability of Medicinal Cannabinoids in Patients With Multiple Sclerosis A Systematic Review and Meta-analysis |journal=JAMA Network Open |date=12 October 2018 |doi=10.1001/jamanetworkopen.2018.3485}}</ref> [[hyperbaric oxygen therapy]],<ref name="pmid14974004">{{cite journal | vauthors = Bennett M, Heard R | title = Hyperbaric oxygen therapy for multiple sclerosis | journal = The Cochrane Database of Systematic Reviews | issue = 1 | pages = CD003057 | year = 2004 | pmid = 14974004 | doi = 10.1002/14651858.CD003057.pub2 | editor1-last = Bennett | editor1-first = Michael H }}</ref> [[helminthic therapy|self-infection with hookworms]], [[reflexology]], [[acupuncture]],<ref name="pmid16420779"/><ref>{{cite news | first=Tim | last=Adams | title=Gut instinct: the miracle of the parasitic hookworm | url=https://www.theguardian.com/lifeandstyle/2010/may/23/parasitic-hookworm-jasper-lawrence-tim-adams | newspaper=The Observer | date=23 May 2010 | deadurl=no | archive-url=https://web.archive.org/web/20141024051021/http://www.theguardian.com/lifeandstyle/2010/may/23/parasitic-hookworm-jasper-lawrence-tim-adams | archive-date=24 October 2014 | df=dmy-all }}</ref> and [[mindfulness]].<ref>{{Cite journal|last=Simpson|first=Robert|year=2014|title=Mindfulness based interventions in multiple sclerosis – a systematic review|url=http://bmcneurol.biomedcentral.com/articles/10.1186/1471-2377-14-15|journal=BMC Neurology|volume=|pages=|via=|deadurl=no|archive-url=https://web.archive.org/web/20170216051037/http://bmcneurol.biomedcentral.com/articles/10.1186/1471-2377-14-15|archive-date=16 February 2017}}</ref> Regarding the characteristics of users, they are more frequently women, have had MS for a longer time, tend to be more disabled and have lower levels of satisfaction with conventional healthcare.<ref name="pmid16420779"/>

==Prognosis==
[[File:Multiple_sclerosis_world_map-DALYs_per_million_persons-WHO2012.svg|thumb|upright=1.3|[[Disability-adjusted life year]] for multiple sclerosis per 100,000&nbsp;inhabitants in 2012
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{{legend|#d85010|151-462}}
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{{refend}}
]]

The expected future course of the disease depends on the subtype of the disease; the individual's sex, age, and initial symptoms; and the degree of [[disability]] the person has.<ref name="pmid8017890"/> Female sex, relapsing-remitting subtype, optic neuritis or sensory symptoms at onset, few attacks in the initial years and especially early age at onset, are associated with a better course.<ref name="pmid8017890"/><ref name="pmid3495637">{{cite journal | vauthors = Phadke JG | title = Survival pattern and cause of death in patients with multiple sclerosis: results from an epidemiological survey in north east Scotland | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 50 | issue = 5 | pages = 523–31 | date = May 1987 | pmid = 3495637 | pmc = 1031962 | doi = 10.1136/jnnp.50.5.523 }}</ref>

The average life expectancy is 30 years from the start of the disease, which is 5 to 10 years less than that of unaffected people.<ref name="pmid18970977"/> Almost 40% of people with MS reach the seventh decade of life.<ref name="pmid3495637"/> Nevertheless, two-thirds of the deaths are directly related to the consequences of the disease.<ref name="pmid18970977"/> [[Suicide]] is more common, while infections and other complications are especially dangerous for the more disabled.<ref name="pmid18970977"/> Although most people lose the ability to walk before death, 90% are capable of independent walking at 10 years from onset, and 75% at 15 years.<ref name="pmid11321195">{{cite journal | vauthors = Myhr KM, Riise T, Vedeler C, Nortvedt MW, Grønning R, Midgard R, Nyland HI | title = Disability and prognosis in multiple sclerosis: demographic and clinical variables important for the ability to walk and awarding of disability pension | journal = Multiple Sclerosis | volume = 7 | issue = 1 | pages = 59–65 | date = February 2001 | pmid = 11321195 | doi = 10.1177/135245850100700110 }}</ref> {{Update inline|reason=The articles referenced here are from 1987 and 2001. Much has happened in the universe of MS research since then. https://www.ncbi.nlm.nih.gov/pubmed/24507525|?=yes|date=September 2015}}

==Epidemiology==
[[File:Multiple sclerosis world map-Deaths per million persons-WHO2012.svg|thumb|left|upright=1.3|Deaths from multiple sclerosis per million persons in 2012 {{refbegin|3}}{{legend|#ffff20|0-0}}{{legend|#ffc020|1-1}}{{legend|#f08015|2-2}}{{legend|#e06815|3–5}}{{legend|#d85010|6–12}}{{legend|#d02010|13–25}}{{refend}}]]
MS is the most common autoimmune disorder of the [[central nervous system]].<ref name="pmid24746689"/> As of 2010, the number of people with MS was 2–2.5&nbsp;million (approximately 30 per 100,000) globally, with rates varying widely in different regions.<ref name=Atlas2008/><ref name=Milo2010/> It is estimated to have resulted in 18,000 deaths that year.<ref name=Loz2012>{{cite journal | vauthors = Lozano R, Naghavi M, Foreman K, Lim S, Shibuya K, Aboyans V, Abraham J, Adair T, Aggarwal R, Ahn SY, Alvarado M, Anderson HR, Anderson LM, Andrews KG, Atkinson C, Baddour LM, Barker-Collo S, Bartels DH, Bell ML, Benjamin EJ, Bennett D, Bhalla K, Bikbov B, Bin Abdulhak A, Birbeck G, Blyth F, Bolliger I, Boufous S, Bucello C, Burch M, Burney P, Carapetis J, Chen H, Chou D, Chugh SS, Coffeng LE, Colan SD, Colquhoun S, Colson KE, Condon J, Connor MD, Cooper LT, Corriere M, Cortinovis M, de Vaccaro KC, Couser W, Cowie BC, Criqui MH, Cross M, Dabhadkar KC, Dahodwala N, De Leo D, Degenhardt L, Delossantos A, Denenberg J, Des Jarlais DC, Dharmaratne SD, Dorsey ER, Driscoll T, Duber H, Ebel B, Erwin PJ, Espindola P, Ezzati M, Feigin V, Flaxman AD, Forouzanfar MH, Fowkes FG, Franklin R, Fransen M, Freeman MK, Gabriel SE, Gakidou E, Gaspari F, Gillum RF, Gonzalez-Medina D, Halasa YA, Haring D, Harrison JE, Havmoeller R, Hay RJ, Hoen B, Hotez PJ, Hoy D, Jacobsen KH, James SL, Jasrasaria R, Jayaraman S, Johns N, Karthikeyan G, Kassebaum N, Keren A, Khoo JP, Knowlton LM, Kobusingye O, Koranteng A, Krishnamurthi R, Lipnick M, Lipshultz SE, Ohno SL, Mabweijano J, MacIntyre MF, Mallinger L, March L, Marks GB, Marks R, Matsumori A, Matzopoulos R, Mayosi BM, McAnulty JH, McDermott MM, McGrath J, Mensah GA, Merriman TR, Michaud C, Miller M, Miller TR, Mock C, Mocumbi AO, Mokdad AA, Moran A, Mulholland K, Nair MN, Naldi L, Narayan KM, Nasseri K, Norman P, O'Donnell M, Omer SB, Ortblad K, Osborne R, Ozgediz D, Pahari B, Pandian JD, Rivero AP, Padilla RP, Perez-Ruiz F, Perico N, Phillips D, Pierce K, Pope CA, Porrini E, Pourmalek F, Raju M, Ranganathan D, Rehm JT, Rein DB, Remuzzi G, Rivara FP, Roberts T, De León FR, Rosenfeld LC, Rushton L, Sacco RL, Salomon JA, Sampson U, Sanman E, Schwebel DC, Segui-Gomez M, Shepard DS, Singh D, Singleton J, Sliwa K, Smith E, Steer A, Taylor JA, Thomas B, Tleyjeh IM, Towbin JA, Truelsen T, Undurraga EA, Venketasubramanian N, Vijayakumar L, Vos T, Wagner GR, Wang M, Wang W, Watt K, Weinstock MA, Weintraub R, Wilkinson JD, Woolf AD, Wulf S, Yeh PH, Yip P, Zabetian A, Zheng ZJ, Lopez AD, Murray CJ, AlMazroa MA, Memish ZA | display-authors = 6 | title = Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the Global Burden of Disease Study 2010 | journal = Lancet | volume = 380 | issue = 9859 | pages = 2095–128 | date = December 2012 | pmid = 23245604 | doi = 10.1016/S0140-6736(12)61728-0 }}</ref> In Africa rates are less than 0.5 per 100,000, while they are 2.8 per 100,000 in South East Asia, 8.3 per 100,000 in the Americas, and 80 per 100,000 in Europe.<ref name=Atlas2008/> Rates surpass 200 per 100,000 in certain populations of Northern European descent.<ref name=Milo2010/> The number of new cases that develop per year is about 2.5 per 100,000.<ref name=Atlas2008/>

Rates of MS appear to be increasing; this, however, may be explained simply by better diagnosis.<ref name=Milo2010/> Studies on populational and geographical patterns have been common<ref name="pmid8269393">{{cite journal | vauthors = Kurtzke JF | title = Epidemiologic evidence for multiple sclerosis as an infection | journal = Clinical Microbiology Reviews | volume = 6 | issue = 4 | pages = 382–427 | date = October 1993 | pmid = 8269393 | pmc = 358295 | doi = 10.1128/CMR.6.4.382 | url = http://cmr.asm.org/cgi/pmidlookup?view=long&pmid=8269393 }}</ref> and have led to a number of theories about the cause.<ref name="pmid17444504"/><ref name="pmid15556803">{{cite journal | vauthors = Marrie RA | title = Environmental risk factors in multiple sclerosis aetiology | journal = The Lancet. Neurology | volume = 3 | issue = 12 | pages = 709–18 | date = December 2004 | pmid = 15556803 | doi = 10.1016/S1474-4422(04)00933-0 }}</ref><ref name="pmid17492755">{{cite journal | vauthors = Ascherio A, Munger KL | title = Environmental risk factors for multiple sclerosis. Part II: Noninfectious factors | journal = Annals of Neurology | volume = 61 | issue = 6 | pages = 504–13 | date = June 2007 | pmid = 17492755 | doi = 10.1002/ana.21141 }}</ref>

MS usually appears in adults in their late twenties or early thirties but it can rarely start in childhood and after 50 years of age.<ref name=Atlas2008/><ref name=Milo2010/> The primary progressive subtype is more common in people in their fifties.<ref name="pmid17884680"/> Similar to many autoimmune disorders, the disease is more common in women, and the trend may be increasing.<ref name="pmid18970977"/><ref name="pmid18606967">{{cite journal | vauthors = Alonso A, Hernán MA | title = Temporal trends in the incidence of multiple sclerosis: a systematic review | journal = Neurology | volume = 71 | issue = 2 | pages = 129–35 | date = July 2008 | pmid = 18606967 | pmc = 4109189 | doi = 10.1212/01.wnl.0000316802.35974.34 }}</ref> As of 2008, globally it is about two times more common in women than in men.<ref name=Atlas2008/> In children, it is even more common in females than males,<ref name="pmid18970977"/> while in people over fifty, it affects males and females almost equally.<ref name="pmid17884680"/>

==History==

===Medical discovery===
[[Image:Carswell-Multiple Sclerosis2.jpg|thumb|Detail of Carswell's drawing of MS lesions in the [[brain stem]] and [[spinal cord]] (1838)]]
[[Robert Carswell (pathologist)|Robert Carswell]] (1793–1857), a British professor of [[pathology]], and [[Jean Cruveilhier]] (1791–1873), a French professor of pathologic anatomy, described and illustrated many of the disease's clinical details, but did not identify it as a separate disease.<ref name="pmid3066846">{{cite journal | vauthors = Compston A | title = The 150th anniversary of the first depiction of the lesions of multiple sclerosis | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 51 | issue = 10 | pages = 1249–52 | date = October 1988 | pmid = 3066846 | pmc = 1032909 | doi = 10.1136/jnnp.51.10.1249 }}</ref> Specifically, Carswell described the injuries he found as "a remarkable lesion of the spinal cord accompanied with atrophy".<ref name="pmid18970977"/> Under the microscope, Swiss pathologist [[Georg Eduard Rindfleisch]] (1836–1908) noted in 1863 that the inflammation-associated lesions were distributed around blood vessels.<ref name="pmid10603616">{{cite journal | vauthors = Lassmann H | title = The pathology of multiple sclerosis and its evolution | journal = Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences | volume = 354 | issue = 1390 | pages = 1635–40 | date = October 1999 | pmid = 10603616 | pmc = 1692680 | doi = 10.1098/rstb.1999.0508 }}</ref><ref>{{cite journal | vauthors = Lassmann H | title = Multiple sclerosis pathology: evolution of pathogenetic concepts | journal = Brain Pathology | volume = 15 | issue = 3 | pages = 217–22 | date = July 2005 | pmid = 16196388 | doi = 10.1111/j.1750-3639.2005.tb00523.x }}</ref>

The French [[neurologist]] [[Jean-Martin Charcot]] (1825–1893) was the first person to recognize multiple sclerosis as a distinct disease in 1868.<ref name="pmid3066846"/> Summarizing previous reports and adding his own clinical and pathological observations, Charcot called the disease ''sclerose en plaques''.

===Diagnosis===

The first attempt to establish a set of diagnostic criteria was also due to Charcot in 1868. He published what now is known as the "Charcot Triad", consisting in [[nystagmus]], [[intention tremor]], and [[telegraphic speech]] (scanning speech)<ref name="Milo">R. Milo, A. Miller, Revised diagnostic criteria of multiple sclerosis, Autoimmunity Reviews 13 (2014), 12 January 2014, 518–524</ref> Charcot also observed cognition changes, describing his patients as having a "marked enfeeblement of the memory" and "conceptions that formed slowly".<ref name="Charcot1"/>

Diagnosis was based on Charcot triad and clinical observation until [[Schumacher criteria|Schumacher]] made the first attempt to standardize criteria in 1965 by introducing some fundamental requirements: Dissemination of the lesions in time (DIT) and space (DIS), and that "signs and symptoms cannot be explained better by another disease process".<ref name="Milo"/> Both requirements were later inherited by [[Poser criteria]] and [[McDonald criteria]], whose 2010 version is currently in use.

During the 20th century, theories about the cause and pathogenesis were developed and effective treatments began to appear in the 1990s.<ref name="pmid18970977"/> Since the beginning of the 21st century, refinements of the concepts have taken place. The 2010 revision of the McDonald criteria allowed for the diagnosis of MS with only one proved lesion (CIS).<ref name=mcdonald2010>{{cite journal | vauthors = Polman CH, Reingold SC, Banwell B, Clanet M, Cohen JA, Filippi M, Fujihara K, Havrdova E, Hutchinson M, Kappos L, Lublin FD, Montalban X, O'Connor P, Sandberg-Wollheim M, Thompson AJ, Waubant E, Weinshenker B, Wolinsky JS | title = Diagnostic criteria for multiple sclerosis: 2010 revisions to the McDonald criteria | journal = Annals of Neurology | volume = 69 | issue = 2 | pages = 292–302 | date = February 2011 | pmid = 21387374 | pmc = 3084507 | doi = 10.1002/ana.22366 }}</ref> Subsequently, three years later, the 2013 revision of the "phenotypes for the disease course" were forced to consider CIS as one of the phenotypes of MS, making obsolete some expressions like "conversion from CIS to MS".<ref>{{cite journal | vauthors = Lublin FD, Reingold SC, Cohen JA, Cutter GR, Sørensen PS, Thompson AJ, Wolinsky JS, Balcer LJ, Banwell B, Barkhof F, Bebo B, Calabresi PA, Clanet M, Comi G, Fox RJ, Freedman MS, Goodman AD, Inglese M, Kappos L, Kieseier BC, Lincoln JA, Lubetzki C, Miller AE, Montalban X, O'Connor PW, Petkau J, Pozzilli C, Rudick RA, Sormani MP, Stüve O, Waubant E, Polman CH | title = Defining the clinical course of multiple sclerosis: the 2013 revisions | journal = Neurology | volume = 83 | issue = 3 | pages = 278–86 | date = July 2014 | pmid = 24871874 | pmc = 4117366 | doi = 10.1212/WNL.0000000000000560 }}</ref>

===Historical cases===
[[File:Animal locomotion. Plate 541 (Boston Public Library).jpg|thumb|left|Photographic study of locomotion of a female with MS with walking difficulties created in 1887 by [[Muybridge]]]]
There are several historical accounts of people who probably had MS and lived before or shortly after the disease was described by Charcot.

A young woman called Halldora who lived in [[Iceland]] around 1200 suddenly lost her vision and mobility but, after praying to the saints, recovered them seven days after. [[Saint Lidwina]] of [[Schiedam]] (1380–1433), a [[Netherlands|Dutch]] [[nun]], may be one of the first clearly identifiable people with MS. From the age of 16 until her death at 53, she had intermittent pain, weakness of the legs, and vision loss—symptoms typical of MS.<ref name="pmid390966">{{cite journal | vauthors = Medaer R | title = Does the history of multiple sclerosis go back as far as the 14th century? | journal = Acta Neurologica Scandinavica | volume = 60 | issue = 3 | pages = 189–92 | date = September 1979 | pmid = 390966 | doi = 10.1111/j.1600-0447.1979.tb08970.x }}</ref> Both cases have led to the proposal of a "Viking gene" hypothesis for the dissemination of the disease.<ref name="pmid16479124">{{cite journal | vauthors = Holmøy T | title = A Norse contribution to the history of neurological diseases | journal = European Neurology | volume = 55 | issue = 1 | pages = 57–8 | year = 2006 | pmid = 16479124 | doi = 10.1159/000091431 }}</ref>

[[Augustus d'Este|Augustus Frederick d'Este]] (1794–1848), son of [[Prince Augustus Frederick, Duke of Sussex]] and [[Lady Augusta Murray]] and the grandson of [[George&nbsp;III of the United Kingdom]], almost certainly had MS. D'Este left a detailed diary describing his 22 years living with the disease. His diary began in 1822 and ended in 1846, although it remained unknown until 1948. His symptoms began at age 28 with a sudden transient visual loss ([[amaurosis fugax]]) after the funeral of a friend. During his disease, he developed weakness of the legs, clumsiness of the hands, numbness, dizziness, bladder disturbances, and [[erectile dysfunction]]. In 1844, he began to use a wheelchair. Despite his illness, he kept an optimistic view of life.<ref>{{cite book|author= Firth D|title= The Case of August D`Esté |year=1948|publisher=Cambridge University Press|location=Cambridge}}</ref><ref name="pmid16103678">{{cite journal | vauthors = Pearce JM | title = Historical descriptions of multiple sclerosis | journal = European Neurology | volume = 54 | issue = 1 | pages = 49–53 | year = 2005 | pmid = 16103678 | doi = 10.1159/000087387 }}</ref> Another early account of MS was kept by the British diarist [[W. N. P. Barbellion]], [[nom-de-plume]] of Bruce Frederick Cummings (1889–1919), who maintained a detailed log of his diagnosis and struggle.<ref name="pmid16103678"/> His diary was published in 1919 as ''[[The Journal of a Disappointed Man]]''.<ref>{{cite book|last= Barbellion|first= Wilhelm Nero Pilate|title= The Journal of a Disappointed Man |year=1919|publisher=George H. Doran|location=New York|isbn= 0-7012-1906-8}}</ref>

==Research==
{{Main|Multiple sclerosis research}}
{{for|the journal formerly known as Multiple Sclerosis|Multiple Sclerosis Journal}}

===Medications===
[[Image:Alemtuzumab Fab 1CE1.png|thumb|upright|Chemical structure of [[alemtuzumab]]]]
There is ongoing research looking for more effective, convenient, and tolerable treatments for relapsing-remitting MS; creation of therapies for the progressive subtypes; [[neuroprotection]] strategies; and effective symptomatic treatments.<ref name="pmid19597083"/>

During the 2000s and 2010s, there has been approval of several oral drugs that are expected to gain in popularity and frequency of use.<ref name="pmid21425270">{{cite journal | vauthors = Miller AE | title = Multiple sclerosis: where will we be in 2020? | journal = The Mount Sinai Journal of Medicine, New York | volume = 78 | issue = 2 | pages = 268–79 | year = 2011 | pmid = 21425270 | doi = 10.1002/msj.20242 }}</ref> Several more oral drugs are under investigation, including [[ozanimod]], [[laquinimod]], and [[estriol]]. Laquinimod was announced in August 2012 and is in a third phase III trial after mixed results in the previous ones.<ref>{{cite news|last=Jeffrey|first=susan|title=CONCERTO: A Third Phase 3 Trial for Laquinimod in MS|url=http://www.medscape.com/viewarticle/768902|access-date=21 May 2013|newspaper=Medscape Medical News|date=9 August 2012|deadurl=no|archive-url=https://web.archive.org/web/20120917000704/http://www.medscape.com/viewarticle/768902|archive-date=17 September 2012}}</ref> Similarly, studies aimed to improve the efficacy and ease of use of already existing therapies are occurring. This includes the use of new preparations such as the [[PEGylation|PEGylated]] version of interferon-β-1a, which it is hoped may be given at less frequent doses with similar effects.<ref name="pmid22201341">{{cite journal | vauthors = Kieseier BC, Calabresi PA | title = PEGylation of interferon-β-1a: a promising strategy in multiple sclerosis | journal = CNS Drugs | volume = 26 | issue = 3 | pages = 205–14 | date = March 2012 | pmid = 22201341 | doi = 10.2165/11596970-000000000-00000 }}</ref><ref name=PEG>{{cite press release|url=http://www.biogenidec.com/press_release_details.aspx?ID=5981&ReqId=1777510|title=Biogen Idec Announces Positive Top-Line Results from Phase 3 Study of Peginterferon Beta-1a in Multiple Sclerosis|publisher=Biogen Idec|date=24 January 2013|access-date=21 May 2013|deadurl=yes|archive-url=https://web.archive.org/web/20131004220459/http://www.biogenidec.com/press_release_details.aspx?ID=5981&ReqId=1777510|archive-date=4 October 2013}}</ref> Estriol, a female sex hormone found at high concentrations during late pregnancy, has been identified as a candidate therapy for women with relapsing-remitting MS and has progressed through Phase II trials.<ref>{{cite journal | vauthors = Gold SM, Voskuhl RR | title = Estrogen treatment in multiple sclerosis | journal = Journal of the Neurological Sciences | volume = 286 | issue = 1–2 | pages = 99–103 | date = November 2009 | pmid = 19539954 | doi = 10.1016/j.jns.2009.05.028 | pmc = 2760629 }}</ref><ref>{{Cite journal|last=Voskuhl|first=Rhonda R|last2=Wang|first2=HeJing|last3=Wu|first3=T C Jackson|last4=Sicotte|first4=Nancy L|last5=Nakamura|first5=Kunio|last6=Kurth|first6=Florian|last7=Itoh|first7=Noriko|last8=Bardens|first8=Jenny|last9=Bernard|first9=Jacqueline T|title=Estriol combined with glatiramer acetate for women with relapsing-remitting multiple sclerosis: a randomised, placebo-controlled, phase 2 trial|journal=The Lancet Neurology|volume=15|issue=1|pages=35–46|doi=10.1016/s1474-4422(15)00322-1|pmid=26621682|year=2016}}</ref> Request for approval of ''peginterferon beta-1a'' is expected during 2013.<ref name=PEG/>

[[Monoclonal antibodies]] have also raised high levels of interest. As of 2012 [[alemtuzumab]], [[daclizumab]], and [[CD20]] monoclonal antibodies such as [[rituximab]], [[ocrelizumab]] and [[ofatumumab]] had all shown some benefit and were under study as potential treatments,<ref name="pmid22224673">{{cite journal | vauthors = Saidha S, Eckstein C, Calabresi PA | title = New and emerging disease modifying therapies for multiple sclerosis | journal = Annals of the New York Academy of Sciences | volume = 1247 | issue = | pages = 117–37 | date = January 2012 | pmid = 22224673 | doi = 10.1111/j.1749-6632.2011.06272.x }}</ref> and the FDA approved ocrelizumab for relapsing and primary MS in March 2017.<ref>{{cite news |title=After 40-year odyssey, first drug for aggressive MS wins FDA approval |url=https://www.statnews.com/2017/03/28/multiple-sclerosis-ms-drug-ocrelizumab/ |date=28 March 2017 |author=Ron Winslow |publisher=STAT |deadurl=no |archive-url=https://web.archive.org/web/20170401151407/https://www.statnews.com/2017/03/28/multiple-sclerosis-ms-drug-ocrelizumab/ |archive-date=1 April 2017 }}</ref> Their use has also been accompanied by the appearance of potentially dangerous adverse effects, the most important of which being opportunistic infections.<ref name="pmid21425270"/> Related to these investigations is the development of a test for [[JC virus]] antibodies, which might help to determine who is at greater risk of developing progressive multifocal leukoencephalopathy when taking natalizumab.<ref name="pmid21425270"/> While monoclonal antibodies will probably have some role in the treatment of the disease in the future, it is believed that it will be small due to the risks associated with them.<ref name="pmid21425270"/>

Another research strategy is to evaluate the [[combination therapy|combined effectiveness]] of two or more drugs.<ref name="pmid21111490">{{cite journal | vauthors = Milo R, Panitch H | title = Combination therapy in multiple sclerosis | journal = Journal of Neuroimmunology | volume = 231 | issue = 1–2 | pages = 23–31 | date = February 2011 | pmid = 21111490 | doi = 10.1016/j.jneuroim.2010.10.021 }}</ref> The main rationale for using a number of medications in MS is that the involved treatments target different mechanisms and, therefore, their use is not necessarily exclusive.<ref name="pmid21111490"/> [[Synergy#Drug synergy|Synergies]], in which one drug improves the effect of another are also possible, but there can also be drawbacks such as the blocking of the action of the other or worsened side-effects.<ref name="pmid21111490"/> There have been several trials of combined therapy, yet none have shown positive enough results to be considered as a useful treatment for MS.<ref name="pmid21111490"/>

Research on neuroprotection and regenerative treatments, such as [[stem cell therapy]], while of high importance, are in the early stages.<ref name="pmid23039386">{{cite journal | vauthors = Luessi F, Siffrin V, Zipp F | title = Neurodegeneration in multiple sclerosis: novel treatment strategies | journal = Expert Review of Neurotherapeutics | volume = 12 | issue = 9 | pages = 1061–76; quiz 1077 | date = September 2012 | pmid = 23039386 | doi = 10.1586/ern.12.59 }}</ref> Likewise, there are not any effective treatments for the progressive variants of the disease. Many of the newest drugs as well as those under development are probably going to be evaluated as therapies for PPMS or SPMS.<ref name="pmid21425270"/>

===Disease biomarkers===
[[File:Journal.pone.0057573.g005 cropped.png|thumb|upright|[[Magnetic resonance imaging|MRI]] brain scan produced using a ''Gradient-echo phase sequence'' showing an iron deposit in a white matter lesion (inside green box in the middle of the image; enhanced and marked by red arrow top-left corner)<ref name="pmid23516409">{{cite journal | vauthors = Mehta V, Pei W, Yang G, Li S, Swamy E, Boster A, Schmalbrock P, Pitt D | title = Iron is a sensitive biomarker for inflammation in multiple sclerosis lesions | journal = PLOS One | volume = 8 | issue = 3 | pages = e57573 | year = 2013 | pmid = 23516409 | pmc = 3597727 | doi = 10.1371/journal.pone.0057573 }}</ref>]]

While diagnostic criteria are not expected to change in the near future, work to develop [[biomarker]]s that help with diagnosis and prediction of disease progression is ongoing.<ref name="pmid21425270"/> New diagnostic methods that are being investigated include work with anti-myelin antibodies, and studies with serum and cerebrospinal fluid, but none of them has yielded reliably positive results.<ref name="pmid19712003">{{cite journal | vauthors = Harris VK, Sadiq SA | title = Disease biomarkers in multiple sclerosis: potential for use in therapeutic decision making | journal = Molecular Diagnosis & Therapy | volume = 13 | issue = 4 | pages = 225–44 | year = 2009 | pmid = 19712003 | doi = 10.1007/BF03256329 }}</ref>

At the current time, there are no laboratory investigations that can predict prognosis. Several promising approaches have been proposed including: [[interleukin-6]], [[nitric oxide]] and [[nitric oxide synthase]], [[osteopontin]], and [[fetuin]]-A.<ref name="pmid19712003"/> Since disease progression is the result of degeneration of neurons, the roles of proteins showing loss of nerve tissue such as [[neurofilament]]s, [[Tau protein|tau]], and [[N-acetylaspartate]] are under investigation.<ref name="pmid19712003"/> Other effects include looking for biomarkers that distinguish between those who will and will not respond to medications.<ref name="pmid19712003"/>

Improvement in neuroimaging techniques such as [[positron emission tomography]] (PET) or [[magnetic resonance imaging]] (MRI) carry a promise for better diagnosis and prognosis predictions, although the effect of such improvements in daily medical practice may take several decades.<ref name="pmid21425270"/> Regarding MRI, there are several techniques that have already shown some usefulness in research settings and could be introduced into clinical practice, such as double-inversion recovery sequences, [[magnetization transfer]], [[Diffusion MRI#Diffusion tensor imaging|diffusion tensor]], and [[functional magnetic resonance imaging]].<ref name="pmid22159052">{{cite journal | vauthors = Filippi M, Rocca MA, De Stefano N, Enzinger C, Fisher E, Horsfield MA, Inglese M, Pelletier D, Comi G | title = Magnetic resonance techniques in multiple sclerosis: the present and the future | journal = Archives of Neurology | volume = 68 | issue = 12 | pages = 1514–20 | date = December 2011 | pmid = 22159052 | doi = 10.1001/archneurol.2011.914 }}</ref> These techniques are more specific for the disease than existing ones, but still lack some standardization of acquisition protocols and the creation of normative values.<ref name="pmid22159052"/> There are other techniques under development that include contrast agents capable of measuring levels of peripheral [[macrophage]]s, inflammation, or neuronal dysfunction,<ref name="pmid22159052"/> and techniques that measure iron deposition that could serve to determine the role of this feature in MS, or that of cerebral perfusion.<ref name="pmid22159052"/> Similarly, new PET [[radiotracer]]s might serve as markers of altered processes such as brain inflammation, cortical pathology, [[apoptosis]], or remylienation.<ref name="pmid20636368">{{cite journal | vauthors = Kiferle L, Politis M, Muraro PA, Piccini P | title = Positron emission tomography imaging in multiple sclerosis-current status and future applications | journal = European Journal of Neurology | volume = 18 | issue = 2 | pages = 226–31 | date = February 2011 | pmid = 20636368 | doi = 10.1111/j.1468-1331.2010.03154.x }}</ref> Antibiodies against the [[Kir4.1]] potassium channel may be related to MS.<ref>{{cite journal | vauthors = Methner A, Zipp F | title = Multiple sclerosis in 2012: Novel therapeutic options and drug targets in MS | journal = Nature Reviews. Neurology | volume = 9 | issue = 2 | pages = 72–3 | date = February 2013 | pmid = 23338282 | doi = 10.1038/nrneurol.2012.277 }}</ref>

===Chronic cerebrospinal venous insufficiency===
{{Main|Chronic cerebrospinal venous insufficiency}}
In 2008, vascular surgeon [[Paolo Zamboni]] suggested that MS involves narrowing of the veins draining the brain, which he referred to as [[chronic cerebrospinal venous insufficiency]] (CCSVI). He found CCSVI in all patients with MS in his study, performed a surgical procedure, later called in the media the "liberation procedure" to correct it, and claimed that 73% of participants improved.<ref name="pmid19060024">{{cite journal | vauthors = Zamboni P, Galeotti R, Menegatti E, Malagoni AM, Tacconi G, Dall'Ara S, Bartolomei I, Salvi F | title = Chronic cerebrospinal venous insufficiency in patients with multiple sclerosis | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 80 | issue = 4 | pages = 392–9 | date = April 2009 | pmid = 19060024 | pmc = 2647682 | doi = 10.1136/jnnp.2008.157164 | url = http://jnnp.bmj.com/cgi/content/full/80/4/392 | archive-url = https://web.archive.org/web/20090804172441/http://jnnp.bmj.com/cgi/content/full/80/4/392 | df = dmy-all | deadurl = no | archive-date = 4 August 2009 }}</ref> This theory received significant attention in the media and among those with MS, especially in Canada.<ref name="pmid23402260">{{cite journal | vauthors = Pullman D, Zarzeczny A, Picard A | title = "Media, politics and science policy: MS and evidence from the CCSVI Trenches" | journal = BMC Medical Ethics | volume = 14 | issue = | pages = 6 | date = February 2013 | pmid = 23402260 | pmc = 3575396 | doi = 10.1186/1472-6939-14-6 }}</ref> Concerns have been raised with Zamboni's research as it was neither blinded nor controlled, and its assumptions about the underlying cause of the disease are not backed by known data.<ref name="pmid20398855">{{cite journal | vauthors = Qiu J | title = Venous abnormalities and multiple sclerosis: another breakthrough claim? | journal = The Lancet. Neurology | volume = 9 | issue = 5 | pages = 464–5 | date = May 2010 | pmid = 20398855 | doi = 10.1016/S1474-4422(10)70098-3 }}</ref> Also, further studies have either not found a similar relationship or found one that is much less strong,<ref name="pmid21161309">{{cite journal | vauthors = Ghezzi A, Comi G, Federico A | title = Chronic cerebro-spinal venous insufficiency (CCSVI) and multiple sclerosis | journal = Neurological Sciences | volume = 32 | issue = 1 | pages = 17–21 | date = February 2011 | pmid = 21161309 | doi = 10.1007/s10072-010-0458-3 }}</ref> raising serious objections to the hypothesis.<ref name="Dorne">{{cite journal | vauthors = Dorne H, Zaidat OO, Fiorella D, Hirsch J, Prestigiacomo C, Albuquerque F, Tarr RW | title = Chronic cerebrospinal venous insufficiency and the doubtful promise of an endovascular treatment for multiple sclerosis | journal = Journal of NeuroInterventional Surgery | volume = 2 | issue = 4 | pages = 309–11 | date = December 2010 | pmid = 21990639 | doi = 10.1136/jnis.2010.003947 }}</ref> The "liberation procedure" has been criticized for resulting in serious complications and deaths with unproven benefits.<ref name="pmid20398855"/> It is, thus, as of 2013 not recommended for the treatment of MS.<ref>{{cite journal | vauthors = Baracchini C, Atzori M, Gallo P | title = CCSVI and MS: no meaning, no fact | journal = Neurological Sciences | volume = 34 | issue = 3 | pages = 269–79 | date = March 2013 | pmid = 22569567 | doi = 10.1007/s10072-012-1101-2 }}</ref> Additional research investigating the CCSVI hypothesis are under way.<ref name="a1">{{cite journal | vauthors = van Zuuren EJ, Fedorowicz Z, Pucci E, Jagannath VA, Robak EW | title = Percutaneous transluminal angioplasty for treatment of chronic cerebrospinal venous insufficiency (CCSVI) in multiple sclerosis patients | journal = The Cochrane Database of Systematic Reviews | volume = 12 | pages = CD009903 | date = December 2012 | pmid = 23235683 | doi = 10.1002/14651858.CD009903.pub2 }}</ref>

== See also ==
* [[List of multiple sclerosis organizations]]
* [[List of people with multiple sclerosis]]

== References ==
{{Reflist}}

== External links ==
{{Medical condition classification and resources
| DiseasesDB = 8412
| ICD10 = {{ICD10|G|35||g|35}}
| ICD9 = {{ICD9|340}}
| OMIM = 126200
| MedlinePlus = 000737
| eMedicineSubj = neuro
| eMedicineTopic = 228
| eMedicine_mult = {{eMedicine2|oph|179}} {{eMedicine2|emerg|321}} {{eMedicine2|pmr|82}} {{eMedicine2|radio|461}}
| MeshID = D009103
| GeneReviewsNBK = NBK1316
| GeneReviewsName = Overview
}}
{{Commons category|Multiple sclerosis}}
* {{dmoz|Health/Conditions_and_Diseases/Neurological_Disorders/Demyelinating_Diseases/Multiple_Sclerosis/}}
* {{dmoz|Health/Conditions_and_Diseases/Neurological_Disorders/Demyelinating_Diseases/Multiple_Sclerosis/}}
* [http://www.atlasofms.org/ Database for analysis and comparison of global data on the epidemiology of MS]
* [http://www.atlasofms.org/ Database for analysis and comparison of global data on the epidemiology of MS]
* [http://clinicaltrials.gov/search/term=Multiple+Sclerosis NIH listing of clinical trials related to MS]
* [http://www.cochrane.org/reviews/en/topics/79.html Abstract index] of the [[Cochrane Library]]
* [http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=gene&part=ms GeneReview/NCBI/NIH/UW entry on Multiple Sclerosis Overview]


{{tsl|en|template:Multiple sclerosis}}
{{Multiple sclerosis}}
{{Diseases of the nervous system}}
{{中枢神经系统疾病}}
{{Autoimmune diseases}}
{{Autoimmune diseases}}


{{DEFAULTSORT:Multiple Sclerosis}}
[[Category:神经系统疾病]]
[[Category:自身免疫性疾病]]
[[Category:Multiple sclerosis| ]]
[[Category:慢性病]]
[[Category:Epstein–Barr virus-associated diseases]]
[[Category:Ailments of unknown cause]]

2019年1月25日 (五) 19:06的版本

Multiple sclerosis
同义词Disseminated sclerosis, encephalomyelitis disseminata
Demyelination by MS. The CD68 colored tissue shows several macrophages in the area of the lesion.
症状Double vision, blindness in one eye, muscle weakness, trouble with sensation, trouble with coordination[1]
起病年龄Age 20–50[2]
病程Long term[1]
类型脫髓鞘病[*]demyelinating disease of central nervous system[*]autoimmune disease of central nervous system[*]疾病
病因Unknown[3]
診斷方法Based on symptoms and medical tests[4]
治療Medications, physical therapy[1]
预后5–10 year shorter life expectancy[5]
患病率2 million (2015)[6]
死亡數18,900 (2015)[7]
分类和外部资源
醫學專科Neurology
ICD-118A40
ICD-9-CM340
OMIM612594、​612596、​612595
DiseasesDB8412
MedlinePlus000737
eMedicine1146199、​1214270、​342254
[编辑此条目的维基数据]

Multiple sclerosis (MS) is a demyelinating disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged.[1] This damage disrupts the ability of parts of the nervous system to communicate, resulting in a range of signs and symptoms, including physical, mental, and sometimes psychiatric problems.[5][8][9] Specific symptoms can include double vision, blindness in one eye, muscle weakness, trouble with sensation, or trouble with coordination.[1] MS takes several forms, with new symptoms either occurring in isolated attacks (relapsing forms) or building up over time (progressive forms).[10] Between attacks, symptoms may disappear completely; however, permanent neurological problems often remain, especially as the disease advances.[10]

While the cause is not clear, the underlying mechanism is thought to be either destruction by the immune system or failure of the myelin-producing cells.[3] Proposed causes for this include genetics and environmental factors such as being triggered by a viral infection.[8][11] MS is usually diagnosed based on the presenting signs and symptoms and the results of supporting medical tests.[4]

There is no known cure for multiple sclerosis.[1] Treatments attempt to improve function after an attack and prevent new attacks.[8] Medications used to treat MS, while modestly effective, can have side effects and be poorly tolerated.[1] Physical therapy can help with people's ability to function.[1] Many people pursue alternative treatments, despite a lack of evidence of benefit.[12] The long-term outcome is difficult to predict, with good outcomes more often seen in women, those who develop the disease early in life, those with a relapsing course, and those who initially experienced few attacks.[13] Life expectancy is on average 5 to 10 years lower than that of an unaffected population.[5]

Multiple sclerosis is the most common immune-mediated disorder affecting the central nervous system.[14] In 2015, about 2.3 million people were affected globally with rates varying widely in different regions and among different populations.[6][15] That year about 18,900 people died from MS, up from 12,000 in 1990.[7][16] The disease usually begins between the ages of 20 and 50 and is twice as common in women as in men.[2] MS was first described in 1868 by Jean-Martin Charcot.[17] The name multiple sclerosis refers to the numerous scars (sclerae—better known as plaques or lesions) that develop on the white matter of the brain and spinal cord.[17] A number of new treatments and diagnostic methods are under development.[18]

Signs and symptoms

Main symptoms of multiple sclerosis

A person with MS can have almost any neurological symptom or sign, with autonomic, visual, motor, and sensory problems being the most common.[5] The specific symptoms are determined by the locations of the lesions within the nervous system, and may include loss of sensitivity or changes in sensation such as tingling, pins and needles or numbness, muscle weakness, blurred vision,[19] very pronounced reflexes, muscle spasms, or difficulty in moving; difficulties with coordination and balance (ataxia); problems with speech or swallowing, visual problems (nystagmus, optic neuritis or double vision), feeling tired, acute or chronic pain, and bladder and bowel difficulties, among others.[5] Difficulties thinking and emotional problems such as depression or unstable mood are also common.[5] Uhthoff's phenomenon, a worsening of symptoms due to exposure to higher than usual temperatures, and Lhermitte's sign, an electrical sensation that runs down the back when bending the neck, are particularly characteristic of MS.[5] The main measure of disability and severity is the expanded disability status scale (EDSS), with other measures such as the multiple sclerosis functional composite being increasingly used in research.[20][21][22]

The condition begins in 85% of cases as a clinically isolated syndrome (CIS) over a number of days with 45% having motor or sensory problems, 20% having optic neuritis, and 10% having symptoms related to brainstem dysfunction, while the remaining 25% have more than one of the previous difficulties.[4] The course of symptoms occurs in two main patterns initially: either as episodes of sudden worsening that last a few days to months (called relapses, exacerbations, bouts, attacks, or flare-ups) followed by improvement (85% of cases) or as a gradual worsening over time without periods of recovery (10–15% of cases).[2] A combination of these two patterns may also occur[10] or people may start in a relapsing and remitting course that then becomes progressive later on.[2] Relapses are usually not predictable, occurring without warning.[5] Exacerbations rarely occur more frequently than twice per year.[5] Some relapses, however, are preceded by common triggers and they occur more frequently during spring and summer.[23] Similarly, viral infections such as the common cold, influenza, or gastroenteritis increase their risk.[5] Stress may also trigger an attack.[24] Women with MS who become pregnant experience fewer relapses; however, during the first months after delivery the risk increases.[5] Overall, pregnancy does not seem to influence long-term disability.[5] Many events have been found not to affect relapse rates including vaccination, breast feeding,[5] physical trauma,[25] and Uhthoff's phenomenon.[23]

Causes

The cause of MS is unknown; however, it is believed to occur as a result of some combination of genetic and environmental factors such as infectious agents.[5] Theories try to combine the data into likely explanations, but none has proved definitive. While there are a number of environmental risk factors and although some are partly modifiable, further research is needed to determine whether their elimination can prevent MS.[26]

Geography

MS is more common in people who live farther from the equator, although exceptions exist.[5][27] These exceptions include ethnic groups that are at low risk far from the equator such as the Samis, Amerindians, Canadian Hutterites, New Zealand Māori,[28] and Canada's Inuit,[2] as well as groups that have a relatively high risk close to the equator such as Sardinians,[2] inland Sicilians,[29] Palestinians, and Parsi.[28] The cause of this geographical pattern is not clear.[2] While the north-south gradient of incidence is decreasing,[27] as of 2010 it is still present.[2]

MS is more common in regions with northern European populations[5] and the geographic variation may simply reflect the global distribution of these high-risk populations.[2] Decreased sunlight exposure resulting in decreased vitamin D production has also been put forward as an explanation.[30][31][32] A relationship between season of birth and MS lends support to this idea, with fewer people born in the northern hemisphere in November as compared to May being affected later in life.[33] Environmental factors may play a role during childhood, with several studies finding that people who move to a different region of the world before the age of 15 acquire the new region's risk to MS. If migration takes place after age 15, however, the person retains the risk of their home country.[5][26] There is some evidence that the effect of moving may still apply to people older than 15.[5]

Genetics

HLA region of Chromosome 6. Changes in this area increase the probability of getting MS.

MS is not considered a hereditary disease; however, a number of genetic variations have been shown to increase the risk.[34] Some of these genes appear to have higher levels of expression in microglial cells than expected by chance.[35] The probability of developing the disease is higher in relatives of an affected person, with a greater risk among those more closely related.[8] In identical twins both are affected about 30% of the time, while around 5% for non-identical twins and 2.5% of siblings are affected with a lower percentage of half-siblings.[5][8][36] If both parents are affected the risk in their children is 10 times that of the general population.[2] MS is also more common in some ethnic groups than others.[37]

Specific genes that have been linked with MS include differences in the human leukocyte antigen (HLA) system—a group of genes on chromosome 6 that serves as the major histocompatibility complex (MHC).[5] That changes in the HLA region are related to susceptibility has been known since the 1980s,[38] and additionally this same region has been implicated in the development of other autoimmune diseases such as diabetes type I and systemic lupus erythematosus.[38] The most consistent finding is the association between multiple sclerosis and alleles of the MHC defined as DR15 and DQ6.[5] Other loci have shown a protective effect, such as HLA-C554 and HLA-DRB1*11.[5] Overall, it has been estimated that HLA changes account for between 20 and 60% of the genetic predisposition.[38] Modern genetic methods (genome-wide association studies) have discovered at least twelve other genes outside the HLA locus that modestly increase the probability of MS.[38]

Infectious agents

Many microbes have been proposed as triggers of MS, but none have been confirmed.[8] Moving at an early age from one location in the world to another alters a person's subsequent risk of MS.[11] An explanation for this could be that some kind of infection, produced by a widespread microbe rather than a rare one, is related to the disease.[11] Proposed mechanisms include the hygiene hypothesis and the prevalence hypothesis. The hygiene hypothesis proposes that exposure to certain infectious agents early in life is protective, the disease is a response to a late encounter with such agents.[5] The prevalence hypothesis proposes that the disease is due to an infectious agent more common in regions where MS is common and where, in most individuals, it causes an ongoing infection without symptoms. Only in a few cases and after many years does it cause demyelination.[11][39] The hygiene hypothesis has received more support than the prevalence hypothesis.[11]

Evidence for a virus as a cause include the presence of oligoclonal bands in the brain and cerebrospinal fluid of most people with MS, the association of several viruses with human demyelination encephalomyelitis, and the occurrence of demyelination in animals caused by some viral infections.[40] Human herpes viruses are a candidate group of viruses. Individuals having never been infected by the Epstein–Barr virus are at a reduced risk of getting MS, whereas those infected as young adults are at a greater risk than those having had it at a younger age.[5][11] Although some consider that this goes against the hygiene hypothesis, since the non-infected have probably experienced a more hygienic upbringing,[11] others believe that there is no contradiction, since it is a first encounter with the causative virus relatively late in life that is the trigger for the disease.[5] Other diseases that may be related include measles, mumps and rubella.[5]

Other

Smoking has been shown to be an independent risk factor for MS.[30] Stress may be a risk factor although the evidence to support this is weak.[26] Association with occupational exposures and toxins—mainly solvents—has been evaluated, but no clear conclusions have been reached.[26] Vaccinations were studied as causal factors; however, most studies show no association.[26] Several other possible risk factors, such as diet and hormone intake, have been looked at; however, evidence on their relation with the disease is "sparse and unpersuasive".[30] Gout occurs less than would be expected and lower levels of uric acid have been found in people with MS. This has led to the theory that uric acid is protective, although its exact importance remains unknown.[41]

Pathophysiology

Multiple sclerosis
Nerve axon with myelin sheath

The three main characteristics of MS are the formation of lesions in the central nervous system (also called plaques), inflammation, and the destruction of myelin sheaths of neurons. These features interact in a complex and not yet fully understood manner to produce the breakdown of nerve tissue and in turn the signs and symptoms of the disease.[5] Cholesterol crystals are believed to both impair myelin repair and aggravate inflammation.[42][43] Additionally, MS is believed to be an immune-mediated disorder that develops from an interaction of the individual's genetics and as yet unidentified environmental causes.[8] Damage is believed to be caused, at least in part, by attack on the nervous system by a person's own immune system.[5]

Lesions

Demyelination in MS. On Klüver-Barrera myelin staining, decoloration in the area of the lesion can be appreciated

The name multiple sclerosis refers to the scars (sclerae – better known as plaques or lesions) that form in the nervous system. These lesions most commonly affect the white matter in the optic nerve, brain stem, basal ganglia, and spinal cord, or white matter tracts close to the lateral ventricles.[5] The function of white matter cells is to carry signals between grey matter areas, where the processing is done, and the rest of the body. The peripheral nervous system is rarely involved.[8]

To be specific, MS involves the loss of oligodendrocytes, the cells responsible for creating and maintaining a fatty layer—known as the myelin sheath—which helps the neurons carry electrical signals (action potentials).[5] This results in a thinning or complete loss of myelin and, as the disease advances, the breakdown of the axons of neurons. When the myelin is lost, a neuron can no longer effectively conduct electrical signals.[8] A repair process, called remyelination, takes place in early phases of the disease, but the oligodendrocytes are unable to completely rebuild the cell's myelin sheath.[44] Repeated attacks lead to successively less effective remyelinations, until a scar-like plaque is built up around the damaged axons.[44] These scars are the origin of the symptoms and during an attack magnetic resonance imaging (MRI) often shows more than ten new plaques.[5] This could indicate that there are a number of lesions below which the brain is capable of repairing itself without producing noticeable consequences.[5] Another process involved in the creation of lesions is an abnormal increase in the number of astrocytes due to the destruction of nearby neurons.[5] A number of lesion patterns have been described.[45]

Inflammation

Apart from demyelination, the other sign of the disease is inflammation. Fitting with an immunological explanation, the inflammatory process is caused by T cells, a kind of lymphocyte that plays an important role in the body's defenses.[8] T cells gain entry into the brain via disruptions in the blood–brain barrier. The T cells recognize myelin as foreign and attack it, explaining why these cells are also called "autoreactive lymphocytes".[5]

The attack of myelin starts inflammatory processes, which triggers other immune cells and the release of soluble factors like cytokines and antibodies. A further breakdown of the blood-brain barrier, in turn, causes a number of other damaging effects such as swelling, activation of macrophages, and more activation of cytokines and other destructive proteins.[8] Inflammation can potentially reduce transmission of information between neurons in at least three ways.[5] The soluble factors released might stop neurotransmission by intact neurons. These factors could lead to or enhance the loss of myelin, or they may cause the axon to break down completely.[5]

Blood–brain barrier

The blood–brain barrier (BBB) is a part of the capillary system that prevents the entry of T cells into the central nervous system. It may become permeable to these types of cells secondary to an infection by a virus or bacteria. After it repairs itself, typically once the infection has cleared, T cells may remain trapped inside the brain.[8] Gadolinium cannot cross a normal BBB and, therefore, gadolinium-enhanced MRI is used to show BBB breakdowns.[46]

Diagnosis

Animation showing dissemination of brain lesions in time and space as demonstrated by monthly MRI studies along a year
Multiple sclerosis as seen on MRI

Multiple sclerosis is typically diagnosed based on the presenting signs and symptoms, in combination with supporting medical imaging and laboratory testing.[4] It can be difficult to confirm, especially early on, since the signs and symptoms may be similar to those of other medical problems.[5][47] The McDonald criteria, which focus on clinical, laboratory, and radiologic evidence of lesions at different times and in different areas, is the most commonly used method of diagnosis[15] with the Schumacher and Poser criteria being of mostly historical significance.[48]

Clinical data alone may be sufficient for a diagnosis of MS if an individual has had separate episodes of neurological symptoms characteristic of the disease.[49] In those who seek medical attention after only one attack, other testing is needed for the diagnosis. The most commonly used diagnostic tools are neuroimaging, analysis of cerebrospinal fluid and evoked potentials. Magnetic resonance imaging of the brain and spine may show areas of demyelination (lesions or plaques). Gadolinium can be administered intravenously as a contrast agent to highlight active plaques and, by elimination, demonstrate the existence of historical lesions not associated with symptoms at the moment of the evaluation.[49][50] Testing of cerebrospinal fluid obtained from a lumbar puncture can provide evidence of chronic inflammation in the central nervous system. The cerebrospinal fluid is tested for oligoclonal bands of IgG on electrophoresis, which are inflammation markers found in 75–85% of people with MS.[49][51] The nervous system in MS may respond less actively to stimulation of the optic nerve and sensory nerves due to demyelination of such pathways. These brain responses can be examined using visual- and sensory-evoked potentials.[52]

While the above criteria allow for a non-invasive diagnosis, and even though some state[5] that the only definitive proof is an autopsy or biopsy where lesions typical of MS are detected,[49][53] currently, as of 2017, there is no single test (including biopsy) that can provide a definitive diagnosis of this disease.[54]

Types

Several phenotypes (commonly termed types), or patterns of progression, have been described. Phenotypes use the past course of the disease in an attempt to predict the future course. They are important not only for prognosis but also for treatment decisions. Currently, the United States National Multiple Sclerosis Society and the Multiple Sclerosis International Federation, describes four types of MS (revised in 2013):[55][56][57]

  1. Clinically isolated syndrome (CIS)
  2. Relapsing-remitting MS (RRMS)
  3. Primary progressive MS (PPMS)
  4. Secondary progressive MS (SPMS)

Relapsing-remitting MS is characterized by unpredictable relapses followed by periods of months to years of relative quiet (remission) with no new signs of disease activity. Deficits that occur during attacks may either resolve or leave problems, the latter in about 40% of attacks and being more common the longer a person has had the disease.[5][4] This describes the initial course of 80% of individuals with MS.[5] When deficits always resolve between attacks, this is sometimes referred to as benign MS,[58] although people will still build up some degree of disability in the long term.[5] On the other hand, the term malignant multiple sclerosis is used to describe people with MS having reached significant level of disability in a short period.[59] The relapsing-remitting subtype usually begins with a clinically isolated syndrome (CIS). In CIS, a person has an attack suggestive of demyelination, but does not fulfill the criteria for multiple sclerosis.[5][60] 30 to 70% of persons experiencing CIS later develop MS.[60]

Primary progressive MS occurs in approximately 10–20% of individuals, with no remission after the initial symptoms.[4][61] It is characterized by progression of disability from onset, with no, or only occasional and minor, remissions and improvements.[10] The usual age of onset for the primary progressive subtype is later than of the relapsing-remitting subtype. It is similar to the age that secondary progressive usually begins in relapsing-remitting MS, around 40 years of age.[5]

Secondary progressive MS occurs in around 65% of those with initial relapsing-remitting MS, who eventually have progressive neurologic decline between acute attacks without any definite periods of remission.[5][10] Occasional relapses and minor remissions may appear.[10] The most common length of time between disease onset and conversion from relapsing-remitting to secondary progressive MS is 19 years.[62]

Other, unusual types of MS have been described; these include Devic's disease, Balo concentric sclerosis, Schilder's diffuse sclerosis, and Marburg multiple sclerosis. There is debate on whether they are MS variants or different diseases.[63] Multiple sclerosis behaves differently in children, taking more time to reach the progressive stage.[5] Nevertheless, they still reach it at a lower average age than adults usually do.[5]

Management

Although there is no known cure for multiple sclerosis, several therapies have proven helpful. The primary aims of therapy are returning function after an attack, preventing new attacks, and preventing disability. Starting medications is generally recommended in people after the first attack when more than two lesions are seen on MRI.[64]

As with any medical treatment, medications used in the management of MS have several adverse effects. Alternative treatments are pursued by some people, despite the shortage of supporting evidence.

Acute attacks

During symptomatic attacks, administration of high doses of intravenous corticosteroids, such as methylprednisolone, is the usual therapy,[5] with oral corticosteroids seeming to have a similar efficacy and safety profile.[65] Although, in general, effective in the short term for relieving symptoms, corticosteroid treatments do not appear to have a significant impact on long-term recovery.[66] The consequences of severe attacks that do not respond to corticosteroids might be treatable by plasmapheresis.[5]

Disease-modifying treatments

Relapsing remitting multiple sclerosis

As of 2017, ten disease-modifying medications are approved by regulatory agencies for relapsing-remitting multiple sclerosis (RRMS). They are interferon beta-1a, interferon beta-1b, glatiramer acetate, mitoxantrone, natalizumab, fingolimod, teriflunomide,[67][68] dimethyl fumarate,[69] alemtuzumab,[70][71] and ocrelizumab.[72]

Their cost effectiveness as of 2012 is unclear.[73] In March 2017 the FDA approved ocrelizumab, a humanized anti-CD20 monoclonal antibody, as a treatment for RRMS,[74][75] with requirements for several Phase IV clinical trials.[76]

In RRMS they are modestly effective at decreasing the number of attacks.[67] The interferons and glatiramer acetate are first-line treatments[4] and are roughly equivalent, reducing relapses by approximately 30%.[77] Early-initiated long-term therapy is safe and improves outcomes.[78][79] Natalizumab reduces the relapse rate more than first-line agents; however, due to issues of adverse effects is a second-line agent reserved for those who do not respond to other treatments[4] or with severe disease.[77] Mitoxantrone, whose use is limited by severe adverse effects, is a third-line option for those who do not respond to other medications.[4] Treatment of clinically isolated syndrome (CIS) with interferons decreases the chance of progressing to clinical MS.[5][80] Efficacy of interferons and glatiramer acetate in children has been estimated to be roughly equivalent to that of adults.[81] The role of some newer agents such as fingolimod, teriflunomide, and dimethyl fumarate, as of 2011, is not yet entirely clear.[82]

As of 2017, rituximab was widely used off-label to treat RRMS.[83]

Progressive multiple sclerosis

As of 2017, rituximab has been widely used off-label to treat progressive primary MS.[83] In March 2017 the FDA approved ocrelizumab as a treatment for primary progressive MS, the first drug to gain that approval,[74][75] with requirements for several Phase IV clinical trials.[76]

截至2011年 (2011-Missing required parameter 1=month!), only one medication, mitoxantrone, has been approved for secondary progressive MS.[84] In this population tentative evidence supports mitoxantrone moderately slowing the progression of the disease and decreasing rates of relapses over two years.[85][86]

Adverse effects

Irritation zone after injection of glatiramer acetate.

The disease-modifying treatments have several adverse effects. One of the most common is irritation at the injection site for glatiramer acetate and the interferons (up to 90% with subcutaneous injections and 33% with intramuscular injections).[87] Over time, a visible dent at the injection site, due to the local destruction of fat tissue, known as lipoatrophy, may develop.[87] Interferons may produce flu-like symptoms;[88] some people taking glatiramer experience a post-injection reaction with flushing, chest tightness, heart palpitations, and anxiety, which usually lasts less than thirty minutes.[89] More dangerous but much less common are liver damage from interferons,[90] systolic dysfunction (12%), infertility, and acute myeloid leukemia (0.8%) from mitoxantrone,[85][91] and progressive multifocal leukoencephalopathy occurring with natalizumab (occurring in 1 in 600 people treated).[4][92]

Fingolimod may give rise to hypertension and slowed heart rate, macular edema, elevated liver enzymes or a reduction in lymphocyte levels.[82] Tentative evidence supports the short-term safety of teriflunomide, with common side effects including: headaches, fatigue, nausea, hair loss, and limb pain.[67] There have also been reports of liver failure and PML with its use and it is dangerous for fetal development.[82] Most common side effects of dimethyl fumarate are flushing and gastrointestinal problems.[69][82] While dimethyl fumarate may lead to a reduction in the white blood cell count there were no reported cases of opportunistic infections during trials.[93][94]

Associated symptoms

Both medications and neurorehabilitation have been shown to improve some symptoms, though neither changes the course of the disease.[95] Some symptoms have a good response to medication, such as an unstable bladder and spasticity, while others are little changed.[5] For neurologic problems, a multidisciplinary approach is important for improving quality of life; however, it is difficult to specify a 'core team' as many health services may be needed at different points in time.[5] Multidisciplinary rehabilitation programs increase activity and participation of people with MS but do not influence impairment level.[96] There is limited evidence for the overall efficacy of individual therapeutic disciplines,[97][98] though there is good evidence that specific approaches, such as exercise,[99][100] and psychological therapies are effective.[101] Cognitive behavioral therapy has shown to be moderately effective for reducing MS fatigue.[102]

Alternative treatments

Over 50% of people with MS may use complementary and alternative medicine, although percentages vary depending on how alternative medicine is defined.[12] The evidence for the effectiveness for such treatments in most cases is weak or absent.[12][103] Treatments of unproven benefit used by people with MS include dietary supplementation and regimens,[12][104][105] vitamin D,[106] relaxation techniques such as yoga,[12] herbal medicine (including medical cannabis),[12][107][108] hyperbaric oxygen therapy,[109] self-infection with hookworms, reflexology, acupuncture,[12][110] and mindfulness.[111] Regarding the characteristics of users, they are more frequently women, have had MS for a longer time, tend to be more disabled and have lower levels of satisfaction with conventional healthcare.[12]

Prognosis

Disability-adjusted life year for multiple sclerosis per 100,000 inhabitants in 2012
  32-68
  68-75
  77-77
  77-88
  88-105
  106-118
  119-119
  120-148
  151-462
  470-910

The expected future course of the disease depends on the subtype of the disease; the individual's sex, age, and initial symptoms; and the degree of disability the person has.[13] Female sex, relapsing-remitting subtype, optic neuritis or sensory symptoms at onset, few attacks in the initial years and especially early age at onset, are associated with a better course.[13][112]

The average life expectancy is 30 years from the start of the disease, which is 5 to 10 years less than that of unaffected people.[5] Almost 40% of people with MS reach the seventh decade of life.[112] Nevertheless, two-thirds of the deaths are directly related to the consequences of the disease.[5] Suicide is more common, while infections and other complications are especially dangerous for the more disabled.[5] Although most people lose the ability to walk before death, 90% are capable of independent walking at 10 years from onset, and 75% at 15 years.[113] [可能过时?]

Epidemiology

Deaths from multiple sclerosis per million persons in 2012
  0-0
  1-1
  2-2
  3–5
  6–12
  13–25

MS is the most common autoimmune disorder of the central nervous system.[14] As of 2010, the number of people with MS was 2–2.5 million (approximately 30 per 100,000) globally, with rates varying widely in different regions.[15][2] It is estimated to have resulted in 18,000 deaths that year.[114] In Africa rates are less than 0.5 per 100,000, while they are 2.8 per 100,000 in South East Asia, 8.3 per 100,000 in the Americas, and 80 per 100,000 in Europe.[15] Rates surpass 200 per 100,000 in certain populations of Northern European descent.[2] The number of new cases that develop per year is about 2.5 per 100,000.[15]

Rates of MS appear to be increasing; this, however, may be explained simply by better diagnosis.[2] Studies on populational and geographical patterns have been common[39] and have led to a number of theories about the cause.[11][26][30]

MS usually appears in adults in their late twenties or early thirties but it can rarely start in childhood and after 50 years of age.[15][2] The primary progressive subtype is more common in people in their fifties.[61] Similar to many autoimmune disorders, the disease is more common in women, and the trend may be increasing.[5][27] As of 2008, globally it is about two times more common in women than in men.[15] In children, it is even more common in females than males,[5] while in people over fifty, it affects males and females almost equally.[61]

History

Medical discovery

Detail of Carswell's drawing of MS lesions in the brain stem and spinal cord (1838)

Robert Carswell (1793–1857), a British professor of pathology, and Jean Cruveilhier (1791–1873), a French professor of pathologic anatomy, described and illustrated many of the disease's clinical details, but did not identify it as a separate disease.[115] Specifically, Carswell described the injuries he found as "a remarkable lesion of the spinal cord accompanied with atrophy".[5] Under the microscope, Swiss pathologist Georg Eduard Rindfleisch (1836–1908) noted in 1863 that the inflammation-associated lesions were distributed around blood vessels.[116][117]

The French neurologist Jean-Martin Charcot (1825–1893) was the first person to recognize multiple sclerosis as a distinct disease in 1868.[115] Summarizing previous reports and adding his own clinical and pathological observations, Charcot called the disease sclerose en plaques.

Diagnosis

The first attempt to establish a set of diagnostic criteria was also due to Charcot in 1868. He published what now is known as the "Charcot Triad", consisting in nystagmus, intention tremor, and telegraphic speech (scanning speech)[118] Charcot also observed cognition changes, describing his patients as having a "marked enfeeblement of the memory" and "conceptions that formed slowly".[17]

Diagnosis was based on Charcot triad and clinical observation until Schumacher made the first attempt to standardize criteria in 1965 by introducing some fundamental requirements: Dissemination of the lesions in time (DIT) and space (DIS), and that "signs and symptoms cannot be explained better by another disease process".[118] Both requirements were later inherited by Poser criteria and McDonald criteria, whose 2010 version is currently in use.

During the 20th century, theories about the cause and pathogenesis were developed and effective treatments began to appear in the 1990s.[5] Since the beginning of the 21st century, refinements of the concepts have taken place. The 2010 revision of the McDonald criteria allowed for the diagnosis of MS with only one proved lesion (CIS).[119] Subsequently, three years later, the 2013 revision of the "phenotypes for the disease course" were forced to consider CIS as one of the phenotypes of MS, making obsolete some expressions like "conversion from CIS to MS".[120]

Historical cases

Photographic study of locomotion of a female with MS with walking difficulties created in 1887 by Muybridge

There are several historical accounts of people who probably had MS and lived before or shortly after the disease was described by Charcot.

A young woman called Halldora who lived in Iceland around 1200 suddenly lost her vision and mobility but, after praying to the saints, recovered them seven days after. Saint Lidwina of Schiedam (1380–1433), a Dutch nun, may be one of the first clearly identifiable people with MS. From the age of 16 until her death at 53, she had intermittent pain, weakness of the legs, and vision loss—symptoms typical of MS.[121] Both cases have led to the proposal of a "Viking gene" hypothesis for the dissemination of the disease.[122]

Augustus Frederick d'Este (1794–1848), son of Prince Augustus Frederick, Duke of Sussex and Lady Augusta Murray and the grandson of George III of the United Kingdom, almost certainly had MS. D'Este left a detailed diary describing his 22 years living with the disease. His diary began in 1822 and ended in 1846, although it remained unknown until 1948. His symptoms began at age 28 with a sudden transient visual loss (amaurosis fugax) after the funeral of a friend. During his disease, he developed weakness of the legs, clumsiness of the hands, numbness, dizziness, bladder disturbances, and erectile dysfunction. In 1844, he began to use a wheelchair. Despite his illness, he kept an optimistic view of life.[123][124] Another early account of MS was kept by the British diarist W. N. P. Barbellion, nom-de-plume of Bruce Frederick Cummings (1889–1919), who maintained a detailed log of his diagnosis and struggle.[124] His diary was published in 1919 as The Journal of a Disappointed Man.[125]

Research

Medications

Chemical structure of alemtuzumab

There is ongoing research looking for more effective, convenient, and tolerable treatments for relapsing-remitting MS; creation of therapies for the progressive subtypes; neuroprotection strategies; and effective symptomatic treatments.[18]

During the 2000s and 2010s, there has been approval of several oral drugs that are expected to gain in popularity and frequency of use.[126] Several more oral drugs are under investigation, including ozanimod, laquinimod, and estriol. Laquinimod was announced in August 2012 and is in a third phase III trial after mixed results in the previous ones.[127] Similarly, studies aimed to improve the efficacy and ease of use of already existing therapies are occurring. This includes the use of new preparations such as the PEGylated version of interferon-β-1a, which it is hoped may be given at less frequent doses with similar effects.[128][129] Estriol, a female sex hormone found at high concentrations during late pregnancy, has been identified as a candidate therapy for women with relapsing-remitting MS and has progressed through Phase II trials.[130][131] Request for approval of peginterferon beta-1a is expected during 2013.[129]

Monoclonal antibodies have also raised high levels of interest. As of 2012 alemtuzumab, daclizumab, and CD20 monoclonal antibodies such as rituximab, ocrelizumab and ofatumumab had all shown some benefit and were under study as potential treatments,[94] and the FDA approved ocrelizumab for relapsing and primary MS in March 2017.[132] Their use has also been accompanied by the appearance of potentially dangerous adverse effects, the most important of which being opportunistic infections.[126] Related to these investigations is the development of a test for JC virus antibodies, which might help to determine who is at greater risk of developing progressive multifocal leukoencephalopathy when taking natalizumab.[126] While monoclonal antibodies will probably have some role in the treatment of the disease in the future, it is believed that it will be small due to the risks associated with them.[126]

Another research strategy is to evaluate the combined effectiveness of two or more drugs.[133] The main rationale for using a number of medications in MS is that the involved treatments target different mechanisms and, therefore, their use is not necessarily exclusive.[133] Synergies, in which one drug improves the effect of another are also possible, but there can also be drawbacks such as the blocking of the action of the other or worsened side-effects.[133] There have been several trials of combined therapy, yet none have shown positive enough results to be considered as a useful treatment for MS.[133]

Research on neuroprotection and regenerative treatments, such as stem cell therapy, while of high importance, are in the early stages.[134] Likewise, there are not any effective treatments for the progressive variants of the disease. Many of the newest drugs as well as those under development are probably going to be evaluated as therapies for PPMS or SPMS.[126]

Disease biomarkers

MRI brain scan produced using a Gradient-echo phase sequence showing an iron deposit in a white matter lesion (inside green box in the middle of the image; enhanced and marked by red arrow top-left corner)[135]

While diagnostic criteria are not expected to change in the near future, work to develop biomarkers that help with diagnosis and prediction of disease progression is ongoing.[126] New diagnostic methods that are being investigated include work with anti-myelin antibodies, and studies with serum and cerebrospinal fluid, but none of them has yielded reliably positive results.[136]

At the current time, there are no laboratory investigations that can predict prognosis. Several promising approaches have been proposed including: interleukin-6, nitric oxide and nitric oxide synthase, osteopontin, and fetuin-A.[136] Since disease progression is the result of degeneration of neurons, the roles of proteins showing loss of nerve tissue such as neurofilaments, tau, and N-acetylaspartate are under investigation.[136] Other effects include looking for biomarkers that distinguish between those who will and will not respond to medications.[136]

Improvement in neuroimaging techniques such as positron emission tomography (PET) or magnetic resonance imaging (MRI) carry a promise for better diagnosis and prognosis predictions, although the effect of such improvements in daily medical practice may take several decades.[126] Regarding MRI, there are several techniques that have already shown some usefulness in research settings and could be introduced into clinical practice, such as double-inversion recovery sequences, magnetization transfer, diffusion tensor, and functional magnetic resonance imaging.[137] These techniques are more specific for the disease than existing ones, but still lack some standardization of acquisition protocols and the creation of normative values.[137] There are other techniques under development that include contrast agents capable of measuring levels of peripheral macrophages, inflammation, or neuronal dysfunction,[137] and techniques that measure iron deposition that could serve to determine the role of this feature in MS, or that of cerebral perfusion.[137] Similarly, new PET radiotracers might serve as markers of altered processes such as brain inflammation, cortical pathology, apoptosis, or remylienation.[138] Antibiodies against the Kir4.1 potassium channel may be related to MS.[139]

Chronic cerebrospinal venous insufficiency

In 2008, vascular surgeon Paolo Zamboni suggested that MS involves narrowing of the veins draining the brain, which he referred to as chronic cerebrospinal venous insufficiency (CCSVI). He found CCSVI in all patients with MS in his study, performed a surgical procedure, later called in the media the "liberation procedure" to correct it, and claimed that 73% of participants improved.[140] This theory received significant attention in the media and among those with MS, especially in Canada.[141] Concerns have been raised with Zamboni's research as it was neither blinded nor controlled, and its assumptions about the underlying cause of the disease are not backed by known data.[142] Also, further studies have either not found a similar relationship or found one that is much less strong,[143] raising serious objections to the hypothesis.[144] The "liberation procedure" has been criticized for resulting in serious complications and deaths with unproven benefits.[142] It is, thus, as of 2013 not recommended for the treatment of MS.[145] Additional research investigating the CCSVI hypothesis are under way.[146]

See also

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