Statin use associated with lower risk of epilepsy after intracranial haemorrhage: A population-based cohort study.

Abstract

To examine the association between statin use before and after intracranial haemorrhage (ICH) and the risk of poststroke epilepsy (PSE). Patients with new-onset ICH between 2004 and 2012 were identified from the Taiwan National Health Insurance Research Database. The main outcome was the occurrence of epilepsy after stroke. Multivariable Cox regression modelling was used to estimate the association between statin use and the risk of PSE, with poststroke medication exposures being treated as time-dependent variables. A total of 7435 patients with ICH were enrolled with a median follow-up of 17.6months. Within the study cohort, 709 patients developed PSE. Poststroke, but not prestroke, stain use was associated with a reduced risk of PSE (adjusted hazard ratio 0.62, 95% confidence interval 0.42-0.90, P=0.01). In subanalyses, a trend of a dose-response relationship was observed. A significant PSE risk reduction was correlated with a higher cumulative statin dose. Moreover, the risk of PSE was lower in patients receiving moderate-to-high-intensity statin therapy (adjusted hazard ratio 0.37, 95% confidence interval 0.18-0.75, P=0.01). Lipophilic and hydrophilic statins were similar with regard to their associations with the reduced risk of PSE. Statin therapy may reduce the risk of PSE after ICH, especially with moderate-to-high therapy intensity. Further research is needed to understand the mechanisms underlying the potential protective effects of statins against PSE in this patient population.