Epilepsy in MS and its association with cognitive and psychological burden

Background: Epilepsy is two to three times more common in patients with multiple sclerosis (pwMS) compared to the general population. Patients with MS and epilepsy without other identifiable causes (MS + E) show greater cortical damage than those without epilepsy (MS-E). However, it's unclear whether MS + E patients exhibit distinct cognitive and neuropsychological features requiring specific management. Methods: In a cohort of pwMS from three MS centers, MS + E patients were identified and data on MS clinical features, epilepsy history, and treatments were collected. A matched group of MS-E patients was included. Assessments included cognitive and neuropsychiatric tests. Cognitive impairment (CI) was defined as scoring >= 1.5 standard deviations below normative values in >= 1 cognitive domain. Results: CI was more prevalent in MS + E (n = 33) patients than in MS-E (n = 33). MS + E patients had lower processing speed (p < 0.01) and visuospatial memory (p = 0.03). MS + E was independently associated with CI (odds ratio 3.6, 95% confidence interval 1.21-12). Somatization, phobia, anxiety, and depression were the most affected neuropsychological domains in MS + E, with global psychological distress negatively correlating with processing speed (rho -0.36, p = 0.048). Conclusions: MS + E is associated with higher CI, particularly in processing speed and visuospatial memory, alongside psychological distress, highlighting the need for targeted multidisciplinary care to improve outcomes and quality of life.