Incidence and predictors of late seizures in intracerebral hemorrhages.

BACKGROUND AND PURPOSE: To identify incidence and predictors of late seizures (LS, occurring >1 week of stroke) in a cohort of patients with intracerebral hemorrhage (ICH). METHODS: Prospective cohort of consecutive adults with spontaneous ICH. Incidence and predictors were identified with Cox regression. We included multivariate analyses on MRI biomarkers (global cortical atrophy, leukoaraiosis, brain microbleeds). RESULTS: Our study population consisted of 325 patients: 54% men, median age 70 years (interquartile range, 58-79). During 778 person-years of follow-up, the incidence rate was 4 new cases/100 person-years (95% confidence interval, 3-6). The median delay between ICH and LS was 9 months (interquartile range, 3-23). The only factor independently associated with the occurrence of LS was a cortical involvement of the ICH (hazard ratio, 2.8; 95% confidence interval, 1.3-6.1). Concerning MRI biomarkers, multivariate analyses found lobar brain microbleeds to be associated with LS (hazard ratio, 2.4; 95% confidence interval, 1.1-5.4), especially if ≥ 3 (hazard ratio, 2.7; 95% confidence interval, 1.1-6.8). LS were associated with a worse functional outcome after 3 years of follow-up (P=0.009). CONCLUSIONS: LS frequently occur >9 months after ICH onset, imposing a long-term follow-up. The association of lobar brain microbleeds with the risk of LS might suggest a link with the underlying vasculopathy (cerebral amyloid angiopathy).