Management of multiple sclerosis: Difference between revisions

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==Disease Modifying treatments==
==Disease modifying treatments==
===Clinically isolated syndrome===
===Clinically isolated syndrome===
The earliest clinical presentation of relapsing-remitting MS (RRMS) is the clinically isolated syndrome (CIS). In CIS, there is a subacute attack suggestive of [[demyelination]] but the person does not fullfill the [[McDonald criteria|criteria]] for multiple sclerosis.<ref name="pmid15847841">{{cite journal |author=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=Lancet neurology |volume=4 |issue=5 |pages=281–8 |year=2005 |pmid=15847841 |doi=10.1016/S1474-4422(05)70071-5}}</ref> Several studies have shown that starting treatment with [[interferon]]s during the initial attack can decrease the chance that a patient will develop MS. These results support the use of interferon after a first clinical demyelinating event and indicate that there may be modest beneficial effects of immediate treatment compared with delayed initiation of treatment.<ref>Jacobs LD; Beck RW; Simon JH; Kinkel RP; Brownscheidle CM; Murray TJ; Simonian NA; Slasor PJ; Sandrock AW. ''Intramuscular interferon beta-1a therapy initiated during a first demyelinating event in multiple sclerosis. CHAMPS Study Group.'' N Engl J Med 2000 September 28;343(13):898–904. PMID 11006365</ref><ref>Comi G; Filippi M; Barkhof F; Durelli L; Edan G; Fernandez O; Hartung H; Seeldrayers P; Sorensen PS; Rovaris M; Martinelli V; Hommes OR.''Effect of early interferon treatment on conversion to definite multiple sclerosis: a randomised study.'' Lancet 2001 May 19;357(9268):1576–82. PMID 11377645</ref><ref name="pmid17679016">{{cite journal |author=Kappos L, Freedman MS, Polman CH, ''et al'' |title=Effect of early versus delayed interferon beta-1b treatment on disability after a first clinical event suggestive of multiple sclerosis: a 3-year follow-up analysis of the BENEFIT study |journal=Lancet |volume=370 |issue=9585 |pages=389–97 |year=2007 |pmid=17679016 |doi=10.1016/S0140-6736(07)61194-5}}</ref>
The earliest clinical presentation of relapsing-remitting MS (RRMS) is the clinically isolated syndrome (CIS). In CIS, there is a subacute attack suggestive of [[demyelination]] but the person does not fullfill the [[McDonald criteria|criteria]] for multiple sclerosis.<ref name="pmid15847841">{{cite journal |author=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=Lancet neurology |volume=4 |issue=5 |pages=281–8 |year=2005 |pmid=15847841 |doi=10.1016/S1474-4422(05)70071-5}}</ref> Several studies have shown that starting treatment with [[interferon]]s during the initial attack can decrease the chance that a patient will develop MS. These results support the use of interferon after a first clinical demyelinating event and indicate that there may be modest beneficial effects of immediate treatment compared with delayed initiation of treatment.<ref>Jacobs LD; Beck RW; Simon JH; Kinkel RP; Brownscheidle CM; Murray TJ; Simonian NA; Slasor PJ; Sandrock AW. ''Intramuscular interferon beta-1a therapy initiated during a first demyelinating event in multiple sclerosis. CHAMPS Study Group.'' N Engl J Med 2000 September 28;343(13):898–904. PMID 11006365</ref><ref>Comi G; Filippi M; Barkhof F; Durelli L; Edan G; Fernandez O; Hartung H; Seeldrayers P; Sorensen PS; Rovaris M; Martinelli V; Hommes OR.''Effect of early interferon treatment on conversion to definite multiple sclerosis: a randomised study.'' Lancet 2001 May 19;357(9268):1576–82. PMID 11377645</ref><ref name="pmid17679016">{{cite journal |author=Kappos L, Freedman MS, Polman CH, ''et al'' |title=Effect of early versus delayed interferon beta-1b treatment on disability after a first clinical event suggestive of multiple sclerosis: a 3-year follow-up analysis of the BENEFIT study |journal=Lancet |volume=370 |issue=9585 |pages=389–97 |year=2007 |pmid=17679016 |doi=10.1016/S0140-6736(07)61194-5}}</ref>

Revision as of 14:04, 26 October 2007

Although there is no known cure for multiple sclerosis, several therapies for multiple sclerosis have proven to be helpful. Multiple sclerosis (abbreviated MS) is a chronic inflammatory demyelinating disease that affects the central nervous system (CNS).

The most common initial course of the disease is the relapsing-remitting subtype and is characterized by unpredictable attacks (relapses) followed by periods of relative remission with no new signs of disease activity. After some years many of the people who have this subtype begin to have neurologic decline without acute relapses being the secondary progressive subtype. Other courses are the primary progressive (decline from the beginning without attacks) and the progressive-relapsing (steady neurologic decline and superimposed attacks); but they are not so common. Different therapies are used for patients experiencing acute attacks, for patients who have the relapsing-remitting subtype, for patients who have the progressive subtypes, for patients without a diagnosis of MS who have a demyelinating event, and for managing the various consequences of MS.

Therapy is aimed at returning function after an attack, preventing new attacks, and preventing disability. As any medical treatment, medications used in the management of MS have several adverse effects, and many possible therapies are still under investigation. At the same time different alternative treatments are followed by many patients, despite a paucity of supporting, comparable, replicated scientific study.

This article focuses on therapies for standard MS; borderline forms of MS have particular treatments that are excluded.

Management of acute attacks

Chemical structure of methylprednisolone. Corticosteroids are used during acute multiple sclerosis relapses.

During symptomatic attacks, patients may be hospitalized. As of 2007, administration of high doses of intravenous corticosteroids, such as methylprednisolone,[1][2] is the routine therapy for acute relapses. These are given over a period of three to five days; having a well established efficacy promoting a better recovery of disability.[3][4]

The aim of this kind of treatment is to end the attack sooner and leave fewer lasting deficits. Although generally effective in the short term for relieving symptoms, corticosteroid treatments do not appear to have a significant impact on long-term recovery: steroids produce a rapid improvement in disability, but this improvement only lasts up to thirty days following the clinical attack, is not evident thirty-six months after the attack, and does not reduce the number of patients who would subsequently develop a clinical relapse.[5]

Recent studies suggest that oral steroid pills are just as effective at treating MS symptoms as intravenous treatment. However, short term treatment with high-dose intravenous corticosteroids does not seem to be attended by adverse effects; on the contrary, gastrointestinal symptoms and psychiatric disorders are more common with oral corticosteroids.[6]


Disease modifying treatments

Clinically isolated syndrome

The earliest clinical presentation of relapsing-remitting MS (RRMS) is the clinically isolated syndrome (CIS). In CIS, there is a subacute attack suggestive of demyelination but the person does not fullfill the criteria for multiple sclerosis.[7] Several studies have shown that starting treatment with interferons during the initial attack can decrease the chance that a patient will develop MS. These results support the use of interferon after a first clinical demyelinating event and indicate that there may be modest beneficial effects of immediate treatment compared with delayed initiation of treatment.[8][9][10]

Relapsing-remitting MS

Disease-modifying treatments are expensive and require frequent injections.

As of 2007, six disease-modifying treatments have been approved by different countries regulatory agencies, like the USA's Food and Drug Administration (FDA), the European Medicines Agency (EMEA) or the Japanese PMDA. Three were interferons: two formulations of interferon beta-1a (trade names Avonex and Rebif; the first given weekly, the latter three times a week),[11][12] or one of interferon beta-1b (U.S. trade name Betaseron, in Europe and Japan Betaferon).[13] The interferons are medications derived from human cytokines which help regulate the immune system. A fourth medication is glatiramer acetate (Copaxone),[14] a mixture of polypeptides which may protect important myelin proteins by substituting itself as the target of immune system attack.[15] The fifth medication, mitoxantrone, is an immunosuppressant also used in cancer chemotherapy. Finally, the sixth medication is natalizumab (marketed as Tysabri).[16] Natalizumab was finally approved in May 2006 after a long process.

All six medications have been proven to be modestly effective at decreasing the number of attacks and slowing progression to disability, although they differ in their efficacy rate. Comparisons between immunomodulators (all but glatiramer) show that the most effective is natalizumab, but studies of its long-term effects are still lacking.[17] Mitoxantrone is probably the most effective of them all;[18] however, its use is limited by severe cardiotoxicity.[19] This is the reason why it is mainly used to treat MS patients who have worsening relapsing-remitting or secondary progressive multiple sclerosis despite prior therapy with interferons or glatiramer acetate.

Medications also differ in ease of use, price and side effects.[20] All of these therapies are expensive and require frequent injections, with Tysabri given as intravenous infusions every four weeks,[16] Avonex requiring weekly injections,[11] Rebif injections three times a week,[12] and Copaxone and Betaseron daily injections.[14][13] Mitoxantrone is intravenously administered every three months as a slow infusion over at least thirty minutes (in order to reduce cardiac toxicity).

Even with appropriate use of medication, most patients with relapsing-remitting MS still suffer from some attacks and subsequent disability.

Progressive MS

Chemical structure of mitoxantrone. In 2007 it was the only approved treatment for secondary progressive multiple sclerosis.

Treatment of progressive MS is more difficult than relapsing-remitting MS, and many patients do not respond to any therapy. A wide range of medications have been used to try to slow the progression of disease.

Mitoxantrone has shown positive effects in patients with a secondary progressive and progressive relapsing courses. It is moderately effective in reducing the disease progression and the frequency of relapses in patients in the short-term follow-up.[21] In 2007, it was the only medication approved was for secondary progressive and progressive relapsing multiple sclerosis; but causes dose-dependent cardiac toxicity which limits its long-term use. Interferon-beta-1b slowed progression of the disease in a clinical trial for secondary progressive MS, but not in another. In both studies however interferon recipients had fewer relapses and less disease activity, assessed by magnetic resonance imaging (MRI). Therefore interferons show promise in secondary progressive MS, but more data is needed to support widespread use.[22]

Several trials have been designed specifically for primary progressive multiple sclerosis (PPMS), including trials with interferons and mitoxantrone, a phase III trial of glatiramer acetate, and an open-label study of riluzole.[23] Patients with PPMS have also been included in trials of azathioprine,[24] methotrexate,[25] cladribine,[26] intravenous immunoglobulin, cyclophosphamide,[27] and studies of haematopoietic stem cell transplantation. However, no treatment in these trials has been proven definitively to modify the course of the disease.[28]

Side effects of treatments

Both the interferons and glatiramer acetate are available only in injectable forms, and both can cause irritation at the injection site.

Interferons are produced in the body during illnesses such as influenza in order to help fight the infection.[29] They are responsible for the fever, muscle aches, fatigue, and headache common during influenza infections. Many patients report influenza-like symptoms when using interferon to fight MS. This reaction often lessens over time and can be treated with over-the-counter fever reducers/pain relievers like paracetamol (known in the U.S. as acetaminophen),[30] ibuprofen,[31] and naproxen.[32] Rare, but potentially serious, liver function abnormalities have also been reported with interferons; requiring that all patients treated regularly be monitored with liver function tests to ensure safe use.[33][34][35] Interferon therapy has also been shown to induce the production of anti-IFN neutralizing antibodies (NAb), usually in the second 6 months of treatment, in 3 to 45% of treated patients. However the clinical consequences of the presence of antibodies are presently unclear: it has not been proved that these antibodies reduce efficacy of treatment. Therefore any treatment decision should be based only on the clinical response to therapy.[36]

Glatiramer acetate is generally considered to be better tolerated than the interferons although some patients taking glatiramer acetate experience a post-injection reaction manifested by flushing, chest tightness, heart palpitations, breathlessness, and anxiety; which usually lasts less than thirty minutes.[37]

Mitoxantrone therapy may be associated with immunosuppressive effects and liver damage; however its most dangerous side effect is its dose-related cardiac toxicity. Therefore careful adherence to the administration and monitoring guidelines is essential; this includes obtaining an echocardiogram and a complete blood count before treatment to decide whether the therapy is suitable for the patient or the risks are too great. It is recommended that mitoxantrone be discontinued at the first signs of heart damage, infection or liver malfunction during therapy.[38]

In phase III studies, natalizumab was highly effective and well tolerated; however, three cases of progressive multifocal leukoencephalopathy (PML) were identified in patients who had taken it in combination with interferons.[39][40] PML is a rare and progressive demyelinating disease of the brain that typically causes permanent disability or death. It is caused by infection by the JC virus (JCV), a virus thought to be present in most healthy individuals; and at first its symptoms may be similar to a MS relapse. There are no known treatments for PML; but the sooner the immune system returns to normal the higher the probabilities for recovery will be.[41]

Management of the effects of MS

Disease modifying treatments only reduce the progression rate of the disease but do not stop it. As multiple sclerosis progresses the symptomatology tends to increase; being MS associated with a variety of symptoms and functional deficits that result in a range of progressive impairments and handicap. Management of these deficits is therefore very important.

Both different medications and neurorehabilitation even though not having influence on disease progression have shown to ease the burden of some symptoms. For other symptoms the efficacy of treatments is still very limited.[42]

Neurorehabilitation

Supervised physical therapy may be helpful to overcome some symptoms.

As for any patient with neurologic deficits, a multidisciplinary approach is key to limiting and overcoming disability. Although there are few studies in MS;[43][44] the general effectiveness of rehabilitation conducted by a team of specialists has been clearly demonstrated in other pathologies such as stroke,[45] or head trauma.[46] When several health care and other professionals are involved with a person with MS they should work together with the person and his or her family, as a team towards common agreed goals and using an agreed common therapeutic approach.[47] There are particular difficulties in specifying a ‘core team’ because people with MS may need help from almost any profession or service at some point.[47] Neurologists will be the main physicians involved, however, depending on the symptom, doctors of other medical specialties may also be helpful. Other treatments such as physical therapy,[48][49] or speech therapy[50] can also help to manage some symptoms and maintain quality of life. Treatment of neuropsychiatric symptoms such as emotional distress and depression should involve mental health professionals such as therapists, psychologists, and psychiatrists;[51] while neuropsychologists can help to evaluate and manage cognitive deficits.[52] Although occupational therapy has shown its efficacy in other chronic and neurologic conditions[53] and some preliminary data suggests that it may be useful in MS,[54] there are not sufficient randomized controlled studies to establish its effectiveness.[53][55]

Medical treatments for symptoms

Multiple sclerosis can cause a variety of symptoms, including changes in sensation (hypoesthesia), muscle weakness, abnormal muscle spasms, or difficulty to move; difficulties with coordination and balance; problems in speech (dysarthria) or swallowing (dysphagia), visual problems (nystagmus, optic neuritis, or diplopia), fatigue and acute or chronic pain syndromes, bladder and bowel difficulties, cognitive impairment, or emotional symptomatology (mainly depression). The main clinical measure of disability progression and severity of the symptoms is the Expanded Disability Status Scale or EDSS.[56] At the same time for each symptom there are different treatment options. Therefore treatments should be individualized depending both on the patient and the physician.

  • Bowel: people with MS may suffer bowel problems in two ways: reduced gut mobility may follow from immobility and the drugs used to treat various impairments; and neurological control of defecation may be directly impaired.[47] Pain or difficulty with defecation can be helped with a diet change, oral laxatives or suppositories and enemas.[64]
  • Dysphagia and dysarthria: dysphagia is a difficulty with swallowing which may cause choking and aspiration of food or liquid into the lungs; while dysarthria is a speech disorder characterised by poor articulation. A language theraphist may give advice on specific swallowing techniques, on adapting food consistencies and dietary intake, on techniques to improve and maintain speech production and clarity; and on alternative communication systems.[47][50] In the case of advanced dysphagia food can be supplied by a nasogastric tube, which is a tube that goes through the nose directly to the stomach; or a percutaneous endoscopic gastrostomy (PEG), which is a procedure for placing a tube into the stomach and therefore administering food directly to it. This second system although more invasive has in the long term better results than nasogastric intake.[78]
  • Fatigue: fatigue is very common and disabling in MS. At the same time it has a close relationship with depressive symptomatology.[79] When depression is reduced fatigue also tends to improve, so patients should be evaluated for depression before other therapeutical approaches are used.[80]. In a similar way other factors like disturbed sleep, chronic pain, poor nutrition, or even some medications can contribute to fatigue; and therefore medical professionals are encouraged to identify and modify them.[47] There are also different medications used to treat fatigue; such as amantadine,[81][82] or pemoline;[83][84] as well as psichological interventions of energy conservation;[85][86] but the effects of all of them are small. For this reason fatigue is a very difficult symptom to manage.
  • Pain: acute pain is mainly due to optic neuritis (with corticosteroids being the best treatment available), as well as trigeminal neuralgia, Lhermitte's sign, or to dysesthesias.[87] Subacute pain is usually secondary to the disease and can be consequence of being to much time in the same position, urinary retention, infected skin ulcers and many others. Treatment will depend on cause. Chronic pain is very common and the harder to treat being its most common cause dysesthesias. Acute pain due to trigeminal neuralgia is usually successfully treated with anticonvulsants such as carbamazepine[88] or phenytoin.[89][90][91] Both Lhermitte's sign and painful dysesthesias usually have a good answer to treatment with carbamazepine, clonazepam,[92] or amitriptyline.[93][94] Sativex is approved for treatment of pain in MS in different countries, but due to its use of cannabis, it is currently not available in others, such as the USA.[95] This medication is also being investigated for the management of other MS symptoms, such as spasticity,[96] and has shown its long term safety and efficacy.[97]
  • Vision: different drugs as well as optic compensatory systems and prisms can be used to improve the symptoms of nystagmus.[106][107][108] Surgery can also be used in some cases for this problem.[109]

Unfortunately other symptoms as ataxia and tremor or sensory losses do not have proven treatments.[47]

Therapies under investigation

Scientists continue their extensive efforts to create new and better therapies for MS. There are a number of treatments under investigation that may curtail attacks or improve function. Some of these treatments involve the combination of drugs that are already in use for multiple sclerosis; such as the combination of mitoxantrone and glatiramer acetate (Copaxone).[110] However most treatments already in clinical trials involve drugs that are used in other diseases. These are the cases of alemtuzumab (trade name Campath),[111] daclizumab (trade name Zenapax),[112] and inosine.[113] Other drugs in clinical trials have been designed specifically for MS, like Fingolimod,[114] Laquinimod,[115] or Neurovax.[116] Finally, there are also many basic investigations that in the future may be able to find new treatments. Examples of these are the studies trying to understand the influence of chlamydophila pneumoniae or vitamin D in the origin of the disease;[117][118] or preliminary investigations on the use of helminthic therapy.[119]

Alternative treatments

Many patients use medical marijuana as an alternative treatment to help them alleviate some symptoms.

Clinical and experimental data suggest that certain dietary regimens, particularly those including polyunsaturated fatty acids, and vitamins might improve outcomes in people with multiple sclerosis.[120][121] Many diets have been proposed for treating the symptoms of the disease. Patients have reported a decrease of symptoms after long-term application of the diets; however no controlled trials have been able to proof their efficacy.[122] Even if these diets really are beneficial for people with MS, it is uncertain whether this fact is due to some special traits of the diets or simply that they are beneficial for whole body health. Some examples of these kind of diets are the Swank Multiple Sclerosis Diet or the The Optimal Diet.[123]

Herbal medicine is another source for alternative treatments. Andrographis paniculata, Glycyrrhiza uralensis and Forsythia suspensa; three medicinal plants traditionally used in China for treating conditions associated with inflammation and viral infection reduced the inflammation of epithelial cells infected by influenza A virus. Since inflammation is crucial in MS in the future these plants could be utilized to ease the progression of the disease.[124] Many patients also use medical marijuana to help alleviate symptoms; however, the results of experimental studies are scarce; but at least a subgroup with greater disability appears to derive some symptomatic benefit.[125][126]

Hyperbaric oxygenation has been the subject of several small studies with heterogeneous results which, overall, do not support its use.[127]

The therapeutic practice of martial arts such as tai chi, relaxation disciplines such as yoga, or general exercise, seem to improve fatigue and quality of life.[128] Some studies also show benefits on physical variables but more investigation is needed since they are usually of low quality.[129]

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Further reading

Clinical guidelines: clinical guidelines are documents with the aim of guiding decisions and criteria in specific areas of healthcare, as defined by an authoritative examination of current evidence (evidence-based medicine).

  • The Royal College of Physicians (2004). Multiple Sclerosis. National clinical guideline for diagnosis and management in primary and secondary care. Salisbury, Wiltshire: Sarum ColourView Group. ISBN 1 86016 182 0.Free full text (2004-08-13). Retrieved on 2007-10-01.
  • Multiple sclerosis. Understanding NICE guidance. Information for people with multiple sclerosis, their families and carers, and the public. London: National Institute of Clinical Excellence. 2003. ISBN 1-84257-445-0. Free full text (2003-26-11). Retrieved on 2007-25-10.