When should Coumadin be resumed post-op?

When should Coumadin be resumed post-op?

• A. Immediately
• B. 12 hours after
• C. 48 hours after
• D. 24 hours after

Answer: (D)

Resuming Coumadin after surgery is about balancing the risk of postoperative bleeding with the risk of thromboembolism from stopping anticoagulation. Warfarin’s effect isn’t immediate and it has a long duration, so you want to avoid restarting too early when the surgical site is still oozing, but you also don’t want to leave the patient off protection for too long.

Restarting about 24 hours after surgery is a practical compromise: once hemostasis is in place and there’s no active bleeding, the wound is more stable, and the risk of a hematoma is reduced. Delaying beyond 24 hours increases the window during which the patient is not anticoagulated and could develop a thrombus, especially in high-risk individuals. Restarting immediately or within 12 hours raises bleeding risk at the operative site. Therefore, 24 hours after is the best answer, provided the surgical site shows good hemostasis and there are no bleeding complications.