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Long And Short-Term Outcome Of Multiple Sclerosis



Weinshenker BG, Issa M, Baskerville J
Arch Neurol 1996 Apr;53(4):353-8
Mayo Clinic and Mayo Foundation, Dept of Neurology, Rochester, Minnesota, USA
PMID# 8929158; UI# 96200245
Abstract

Background
The anticipated rate of short-term worsening of disability scores is the basis of power estimations in clinical trials of Progressive Multiple Sclerosis (MS).

While the clinician is most concerned in modifying the long-term outcome (eg, time to reach the Expanded Disability Status Scale [EDSS] 6), the end points studied in clinical trials are those describing short-term outcome (eg, worsening of EDSS scores over 1 to 3 years).

However, short-term outcome of MS may not be correlated with long-term outcome.

Objectives
To validate previously published models predicting time to EDSS 6. To establish predictors of short-term outcome of MS.

Setting & Patients
The Ottawa, Ontario, Regional Multiple Sclerosis Clinic. Two hundred fifty-nine patients were followed up prospectively by a single Neurologist.

Main Outcome Measures
Actuarial analysis of time to reach EDSS 6 and change in EDSS scores over a follow-up period of 1 to 3 years.

    Results

  1. The long-term outcome in the Ottawa population was more favorable than published data from London, Ontario.

  2. Predictions of time to EDSS 6 were not strongly correlated with the degree of short-term worsening over the follow-up period.

  3. Parameters associated with a higher probability of short-term worsening were proximity of the baseline EDSS score to 4.5 and duration of MS less than 20 years.

Conclusion
Baseline EDSS and duration of MS must be considered in the design of clinical trials of Progressive MS.



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