The Influence of Menopause in Multiple Sclerosis Course: A Longitudinal Cohort Study

Hormonal variations are known to influence the course of multiple sclerosis (MS).

We aimed to evaluate the impact of menopause in MS course, including disease activity and disability progression.

We conducted a retrospective longitudinal cohort study including all women, older than 44, post-menopausal, with a diagnosis of MS at least 1 year before menopause. We evaluated the impact of menopause in MS course comparing clinical and radiologic outcomes within 5 years before and after menopause. We repeated the analysis in subgroups of patients without disease-modifying treatment (DMT) change or co-morbidities diagnosed during the observation period, considering that those factors might also impact MS outcomes.

Thirty-seven women, with a mean age at the time of menopause of 49.8 (±4.06) years were included in the analysis. Within 5 years following menopause, we observed a decrease in the annualized relapse rate (0.37 ± 0.35 pre-menopause vs. 0.08 ± 0.18 post-menopause, p < 0.001) compared with the same period before menopause, while the EDSS progression rate remained stable (0.13 ± 0.24 EDSS point/year pre-menopausal vs. 0.13 ± 0.18 post-menopause, p = 0.935). EDSS progression events frequency was similar before and after the menopause (37.8 vs. 48.6%, respectively, p = 0.424). These observations persisted in patients' subgroups without DMT switch or co-morbidities.

Following menopause, we observed a reduction in the relapse rate, but the disability progression continued at a similar rate, compared to the pre-menopausal period. These observations persisted in the subgroup of patients without changes in DMT or co-morbidities diagnosed during the observation period.