<p><b>INTRODUCTION:</b> Atrial fibrillation increases five times the risk of stroke. Anticoagulation reduces the incidence of cerebrovascular events. However, many patients do not receive thromboprophylaxis.<br> <b>OBJECTIVES:</b> To estimate the prevalence of atrial fibrillation in the older patients at a Brazilian university hospital and the proportion of anticoagulation prescription. Secondary objectives wer...