Researchers investigated whether differences exist between the sexes in the risk of ischaemic stroke in patients with atrial fibrillation.1 A nationwide retrospective cohort study design was used. Data were taken from the Swedish national discharge register. Participants were 100 802 patients with a first diagnosis of atrial fibrillation between 1 July 2005 and 31 December 2008, with a total follow-up of 139 504 years at risk (median 1.2). Information about drug treatment was taken from the Swedish drug register. Patients were excluded if at baseline they were prescribed warfarin, had mitral stenosis, or had previous valvular surgery. Patients who died less than 14 days from baseline were also excluded.
over 5 years ago