Brain, Vol. 112, No. 1, 133-146, 1989
© 1989 Oxford University Press
research-article |
THE NATURAL HISTORY OF MULTIPLE SCLEROSIS: A GEOGRAPHICALLY BASED STUDY
I. CLINICAL COURSE AND DISABILITY
Department of Clinical Neurological Sciences, University of Western Ontario London, Ontario, Canada
Correspondence to:
Correspondence to: Dr G. C. Ebers, Department of Clinical Neurological Sciences, University Hospital, PO Box 5339, London, Ontario N6A 5A5, Canada
The outcome of multiple sclerosis (MS), assessed according to the Kurtzke Disability Status Scale (DSS), was reviewed in 1,099 consecutive patients followed in London, Canada, between 1972 and 1984. A geographically based subgroup of 196 patients representing 90% of Middlesex County MS patients as well as a group of 197 patients seen from onset of disease were separately analysed. The clinical course was progressive from onset in 33% of the total population and in 28% of the Middlesex County subgroup Of those with duration of 6–10 yrs, 30–40% with initially remitting disease developed progressive MS. The cross-sectional distribution of disability was bimodal with peaks at DSS 1 (no disability) and DSS 6 (assistance required for walking). Actuarial analysis showed that the median time to reach DSS 6 from onset of MS was 14.97±0.31 yrs in the total population and 9.42±0.44 yrs in the ‘seen from onset’ subgroup Survival was minimally altered; 87% of patients followed up to 40 yrs were still alive, although ascertainment of cases with this duration of MS was incomplete Data describing the rate at which disability develops after the onset of a progressive phase of MS are also presented. The implications of these data in planning and interpretation of clinical therapeutic trials are discussed.
Received January 12, 1988. Revised May 10, 1988. Accepted June 1, 1988.
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