Background: Warfarin and other anticoagulants increase the risk of hemorrhagic complications, including upper gastrointestinal hemorrhages (UGIB). Warfarin is commonly used in the management of atrial fibrillation to reduce the risk of ischemic stroke, and frequently resumed following UGIB. However, optimal timing of reinitiation remains unclear. Theory suggests that resuming warfarin immediately after UGIB would lead [...]