F10 and atrial fibrillation: Anticoagulation with warfarin, FXa inhibitor, or direct thrombin inhibitor is recommended for at least 3 weeks prior and a minimum of 4 weeks after cardioversion for patients with AFib or AF of 48 hours duration or longer, or if the duration of AFib is unknown. This recommendation is regardless of the CHA2DS2-VASc score or method of cardioversion