What is the appropriate management of an acute multiple sclerosis (MS) flare in the emergency department?

Management of Acute MS Flare in the Emergency Department

For an acute MS flare in the ED, initiate high-dose intravenous methylprednisolone 1 gram daily for 3-5 days, ideally after obtaining MRI brain/spine and considering lumbar puncture to confirm active demyelination, though treatment should not be delayed if imaging is unavailable. 1, 2

Initial Assessment & Diagnostic Workup

When a patient with MS presents to the ED with new or worsening neurological symptoms, the critical first step is distinguishing a true relapse from a pseudoexacerbation:

Rule Out Pseudoexacerbation First

• Check for systemic triggers: infection (UTI most common), fever, heat exposure, sleep deprivation, metabolic derangements 1, 3
• Key point: Pseudoexacerbations represent worsening of old symptoms due to systemic stressors, not new inflammatory activity
• Pseudoexacerbations account for a significant portion of ED visits and do NOT require corticosteroids 4

True Relapse Criteria

A genuine MS relapse involves:

• New neurological symptoms or objective worsening of old symptoms
• Lasting >24 hours
• Occurring in the absence of fever or infection
• Separated from previous relapse by ≥30 days 1

Diagnostic Testing

MRI Brain and Spine (with and without contrast):

• Active demyelination appears as gadolinium-enhancing lesions 5
• MRI shows active disease in ~87.5% of true MS exacerbations 5
• Important caveat: Spinal MRI adds limited value when brain MRI is already positive—isolated spinal lesions occur in only ~10% of cases 5
• However, if clinical presentation suggests myelopathy, spinal imaging is warranted

Lumbar Puncture:

• Consider when diagnosis is uncertain or imaging inconclusive 6
• CSF analysis: cell count with differential, protein, glucose, oligoclonal bands
• Rule out infectious mimics (HSV PCR, other viral PCRs as indicated)

Treatment Protocol

High-Dose Corticosteroids (First-Line)

Standard Regimen:

• Methylprednisolone 1 gram IV daily for 3-5 days 6, 1, 2
• Alternative: Methylprednisolone 1-2 mg/kg/day IV 6

Followed by oral taper:

• Prednisone taper over 11-14 days (e.g., starting at 60-80 mg daily) 2
• Some protocols use 4-6 week tapers for severe cases 6

Evidence basis: The Optic Neuritis Treatment Trial established that high-dose IV methylprednisolone hastens recovery from acute MS attacks, though it does not alter final degree of recovery 2

Refractory Cases

If no improvement after 3-5 days of pulse steroids or symptoms worsen:

Plasma Exchange (PLEX):

• Consider 5-7 exchanges over 10-14 days 6
• Particularly effective for severe, steroid-unresponsive relapses
• Timing matters: Do not give IVIG immediately before PLEX as it will be removed 6

IVIG:

• Dose: 2 g/kg IV divided over 5 days (0.4 g/kg/day) 6
• Slower onset of action compared to PLEX
• Alternative when PLEX contraindicated

Admission Criteria

Admit for:

• Severe functional impairment limiting self-care
• Respiratory compromise or bulbar symptoms
• Rapidly progressive symptoms
• Need for IV corticosteroids with close monitoring
• Inability to safely ambulate or perform ADLs 1, 7

Can consider discharge with:

• Mild symptoms not limiting function
• Reliable follow-up with neurology within 1-2 weeks
• Ability to complete oral steroid taper at home
• No red flags (respiratory, bulbar, rapidly ascending symptoms)

Critical Pitfalls to Avoid

1. Over-reliance on MRI: While MRI is valuable, clinical diagnosis of relapse can be made without it—don't delay treatment waiting for imaging if true relapse is clinically evident 5

2. Treating pseudoexacerbations: Corticosteroids won't help and expose patients to unnecessary risks. Always address underlying trigger first 4

3. Ordering unnecessary spinal MRI: If brain MRI shows active disease and clinical picture fits, spinal imaging adds little 5

4. Low-dose oral steroids: Oral prednisone alone (without IV loading) is LESS effective than high-dose IV methylprednisolone 2

5. Missing concurrent myocarditis: Check troponin and ECG, especially if patient has concurrent myositis symptoms (weakness, elevated CK) 6

Neurology Consultation

• Mandatory for severe cases (G3-4 symptoms) 6
• Strongly recommended for all suspected relapses to guide workup and confirm diagnosis 1
• Arrange outpatient neurology follow-up within 1-2 weeks for all ED visits related to MS 4

Special Considerations

Concurrent infection: Treat infection first before considering corticosteroids for relapse 1

Pregnancy: High-dose methylprednisolone can be used if benefits outweigh risks; avoid during first trimester if possible 3

Disease-modifying therapy: Do not initiate or change DMTs in the ED—this is an outpatient neurology decision 3