What is the recommended acute treatment for a multiple sclerosis relapse?

Acute Treatment for Multiple Sclerosis Relapses

High-dose corticosteroids—either oral or intravenous—are the first-line treatment for acute MS relapses, with equivalent efficacy between routes of administration. 1

First-Line Treatment: Corticosteroids

• Administer high-dose corticosteroids immediately for relapses that impair function or are bothersome to the patient 2, 3
• Oral and intravenous routes are equally effective: No significant differences exist in EDSS score reduction at 1 week (WMD 0.32, p=0.129) or 4 weeks (WMD 0.11, p=0.355) between administration routes 1
• Oral corticosteroids offer practical advantages: Comparable efficacy to IV methylprednisolone at a fraction of the cost, improving access to prompt treatment 2
• Note the main side effect difference: Insomnia is significantly more common with oral steroids (RR 1.25, p=0.005) 1

Second-Line Treatment: Plasma Exchange

• Use plasma exchange (PLEX) for severe relapses that fail to respond to corticosteroids, particularly when there is persistent contrast-enhancement of the symptomatic lesion on repeat MRI 3
• PLEX serves as acute rescue therapy when neurological deficits remain severe after steroid treatment 3

Third-Line Treatment: Alternative Immunosuppression

For exceptional cases of fulminant or tumefactive disease failing both steroids and PLEX:

• Consider cytotoxic agents such as cyclophosphamide or B-cell-depleting regimens like rituximab, though these likely accelerate remission rather than provide immediate relapse remedy 3
• Carefully weigh risks given the aggressive nature of these interventions 3

Additional Therapeutic Considerations

• ACTH (adrenocorticotropic hormone) provides an alternative to glucocorticoids but is currently much more expensive without proven superiority 3
• Natalizumab as acute therapy is not recommended: A single dose given for acute MS relapse did not improve clinical outcomes in randomized controlled trials 3

Essential Pre-Treatment Evaluation

Before initiating treatment, confirm the diagnosis and exclude mimics:

• Rule out pseudo-relapses triggered by urinary tract infections, fever, or metabolic derangements 3
• MRI may be useful for confirmation and to evaluate for multifocal disease activity, though MS relapse remains primarily a clinical diagnosis 2
• Recognize that accurate identification is critical to reduce corticosteroid overuse and attendant risks 2

Complementary Management

• Prioritize symptom management and neurorehabilitation as important aspects of relapse care 3
• Consider relapses as indicators of inadequate disease control: They should prompt evaluation of whether to transition to more effective disease-modifying therapy 3

Common Pitfalls to Avoid

• Do not delay treatment while awaiting MRI confirmation if clinical diagnosis is clear 2
• Do not treat all relapses: Only those that are bothersome or impair function require intervention 3
• Do not assume complete recovery: Even with prompt and effective treatment, clinical or subclinical sequelae frequently remain 2