Warfarin users prone to coagulopathy in first 30 days after hospital discharge from gastric bypass.

Background: Lehigh Valley Health Network (LVHN), a nonprofit tertiary care facility in Allentown, Pennsylvania, is an accredited American College of Surgeons Bariatric Surgery Center Network (ACSBSCN) Level 1 site performing 400+ bariatric procedures annually. Bariatric data submission began in April 2008. Complication review revealed that approximately 17 % of patients on chronic anticoagulation (warfarin) therapy preoperatively were readmitted with supratherapeutic international normalized ratios (INRs), postsurgical bleeding, anastomotic ulcer, or other intraluminal hemorrhage.