Bleeding rates in patients older than 90 years of age on vitamin K antagonist therapy for nonvalvular atrial fibrillation

Extremely elderly patients are being treated with anticoagulant therapy with increasing frequency. We sought to assess the rates of bleeding in such patients and to carefully examine risk factors that might predict this bleeding. This was a prospective cohort study conducted from 1 January 2007 to 29 February 2008 at an anticoagulation clinic in Modena, Italy. Ninety patients, 90 years or older, among 1635 patients with nonvalvular atrial …