A, Dose-dependent contractile response of coronary arterioles to vasopressin (10−8-10−5M) from non-diabetic (ND) patients before cardoplegic ischemia and cardiopulmonary bypass (pre-CP/CPB-ND), post-CP/CPB-ND; and from diabetic patients (DM), pre-CP/CPB-DM and post-CP/CPB-DM. B, the bar graph showing the coronary arteriolar contractile response to vasopressin at 10−5M. *P<0.05 vs. pre-CP/CPB-ND, #P<0.05 vs. post-CP/CPB-ND; n = 8/group, mean ± SD.