CAT enzyme activity, GSH and TAS (P<0.05, P<0.05, P<0.01) were significantly lower than the control group in the after surgery with CPB (7th day AS) group, while the GSH level was lower in the CAD (BS) group than after surgery with CPB (7th day AS) (P<0.001) group. Here, CAT is linked to coronary artery disorder.