PMID: 9647301Jul 1, 1998Paper

Clinical relapses and disease activity on magnetic resonance imaging associated with viral upper respiratory tract infections in multiple sclerosis

Journal of Neurology, Neurosurgery, and Psychiatry
S EdwardsL D Blumhardt

Abstract

Although the risk of clinical attacks of multiple sclerosis seems to be significantly increased with viral upper respiratory tract infections (URTI), serological evidence for the reported association remains controversial. In addition, although MRI is six to 10 times more sensitive than clinical exacerbations in indexing disease activity, any possible association between URTI and MRI activity has yet to be investigated. To examine the relation between URTI and disease activity, in multiple sclerosis patients participating in a placebo controlled trial of interferon beta-1a, as indexed both by clinical exacerbation rate and by the number and volume of gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA) enhancing lesions on MRI. "At risk" periods were defined around symptomatic URTI, with or without serological confirmation. The relative risk of clinical relapse for serologically unconfirmed symptomatic URTI was 2.1 (p=0.004). Raised antiviral antibody titres conferred a relative risk of multiple sclerosis exacerbations that was 3.4 times higher than the "not at risk" periods (annual attack rates of 5.7 v 1.6, respectively, p=0.006). There was no definite relation between the number or the volume of active lesions on MRI and ...Continue Reading

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