SUMMARY. Total plasma antioxidant status (TPAS), lipid peroxide concentration (LPX) and cardiac troponin T (cTnT) were measured in 24 patients undergoing coronary artery bypass grafting (CABO) with cardiopulmonary bypass (CPB). Samples were obtained preoperatively and at 1·5 h, 6 h, 24 hand 72 h after CPB. The absolute TPAS values were significantly lower at 1·5 h, 6 h, 24 hand 72 h after CPB than were preoperative values (P