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Patients who have atrial fibrillation (AF) have increased thromboembolic risk. This risk is mitigated through use of anticoagulants, traditionally with vitamin K antagonists such as warfarin, and more recently with drugs such as Xa and thrombin inhibitors. Since anticoagulants increase the risk of bleeding, uncertainty exists regarding their use in the perioperative period. The risk of thromboembolism...