Electroconvulsive therapy and later stroke in patients with affective disorders

The long-term effects of electroconvulsive therapy (ECT) on the risk of stroke are unknown. We examined the association between ECT and risk of incident or recurrent stroke. A cohort of 174 534 patients diagnosed with affective disorder between 2005 and 2016 in the Danish National Patient Registry were followed for stroke until November 2016. The association between ECT and stroke was analysed using Cox regression with multiple adjustment and propensity-score matching on sociodemographic and clinical variables. In 162 595 patients without previous stroke, 5781 (3.6%) were treated with ECT. The total number of patients developing stroke during follow-up was 3665, of whom 165 had been treated with ECT. In patients