Contribution of relapses to disability in multiple sclerosis

Area of Science:

• Neurology
• Immunology
• Clinical Medicine

Background:

• The long-term impact of multiple sclerosis (MS) relapses on disability progression is not fully understood.
• Existing evidence suggests relapses significantly influence patient prognosis.
• Quantifying relapse contribution to fixed disability is crucial for MS management.

Purpose of the Study:

• To assess the outcome of relapses in a large cohort of multiple sclerosis patients.
• To identify prognostic factors influencing recovery post-relapse.
• To determine the contribution of relapses to accumulated fixed disability in MS.

Main Methods:

• Assessed 279 relapses in 182 patients using the Expanded Disability Status Scale (EDSS).
• Evaluated patients before, during, and after relapse for disability changes.
• Analyzed factors including sex, age, and relapse site for their impact on recovery.

Main Results:

• Mean EDSS increased from 3.73 pre-relapse to 5.18 during relapse and 4.23 post-relapse.
• Average residual disability increase was 0.50 EDSS points.
• Nearly 50% of patients had at least a 0.5 EDSS point increase, and 32.7% had at least a 1-point increase post-relapse.
• Recovery was incomplete in about half of the patients, irrespective of sex, age, or relapse site.

Conclusions:

• Acute relapses frequently lead to objective worsening of disability in multiple sclerosis patients.
• Recovery from relapses is often incomplete and not significantly influenced by patient demographics or lesion location.
• Therapies aimed at reducing relapse frequency or severity may prevent long-term disability accumulation in MS.