Effect of aspirin on postoperative bleeding in coronary artery bypass grafting.

PURPOSE It is not uncommon for aspirin therapy to be withheld before coronary artery bypass grafting (CABG) because it is thought to increase the risk of postoperative bleeding. Many studies have shown that continued aspirin therapy reduces postoperative myocardial infarction and increases survival. The purpose of this study is to analyze the effect of preoperative aspirin on postoperative bleeding in patients undergoing CABG. MATERIAL AND METHODS Patients (n=30) undergoing CABG were divided into two groups, group 1 (n=15) who received aspirin till the day of surgery, and group 2 in whom aspirin was stopped 5 days before surgery. Postoperative bleeding up to 76 h (approximately 3 days) was noted in both groups. RESULTS Preoperative, intraoperative, and postoperative variables were equal in both groups. Postoperative bleeding in the 2nd hour was significantly lower in group 1 compared to group 2 (p=0.004). Bleeding 28-76 h postoperatively was also significantly lower in the first group (p=0.043). CONCLUSION Our study suggests that contrary to the commonly held beliefs in our setup, the use of aspirin till the date of surgery does not increase the risk of postoperative bleeding after CABG. In contrast, our data show reductions in the bleeding incidence of those in whom aspirin was not withheld prior to surgery. Therefore we strongly recommend its continued use of aspirin until the date of surgery.