For more information regarding Bristol-Myers Squibb Clinical Trial participation, please visit www.BMSStudyConnect.com  Inclusion Criteria:  Adult patients (>= 18 years old) Patients who can understand all study information and literature to provide fully informed consent Atrial fibrillation (AF) as the primary diagnosis Having a major or minor bleed up to a maximum of 30 days prior to point of enrolment Receiving oral anticoagulation therapy for AF  Exclusion Criteria:  Pregnant women Patients with active cancer Patients unable to consent for themselves Patient on concomitant antiplatelet therapy