One hundred patients (sixty five male and thirty five femalepatients) post coronary artery bypassgraft (CABG) were evaluated for eligibility to enter the trial. The percentage of platelet aggregation was compared between low dose (<100 mg/day), and high dose (>100 mg/day) aspirin, at postoperative CABG days 2 and 8, which showed no significant difference for the platelet aggregation (p = 0.161 post CABG day 2 and p = 0.098 post CABG day 8).