Purpose: In this study, we estimate the impact of a recent relapse on physical and mental health in subjects with relapsing-remitting multiple sclerosis (RRMS) using validated patient-reported outcome (PRO) measures.
Methods: Subjects enrolled in the Comprehensive Longitudinal Investigation of MS at the Brigham and Women's Hospital with RRMS were eligible for enrollment. Subjects with a clinical visit within 45 days of a relapse were identified and divided into groups based on whether the relapse occurred before (recent relapse) (n = 59) or after the visit (pre-relapse) (n = 31). A group of subjects with no relapses was also identified (remission) (n = 336). PRO measures in these three groups were compared. All outcomes were compared using a t test and linear regression controlling for age, disease duration, sex, and EDSS.
Results: Subjects with a recent relapse had significantly worse functioning on several physical and mental health scales compared to subjects in remission even after adjusting for potential confounders. Subjects with a recent relapse also showed significant deterioration on PRO measures over 1 year compared to subjects in remission (P < 0.05 for each comparison). Subjects in the pre-relapse group were not significantly different than subjects in remission.
Conclusions: Clinical relapses have a measurable effect on PRO in subjects with RRMS.