A, Dose-dependent contractile response of atrial coronary arterioles to vasopressin in the presence or absence of V1 receptor blocker SR490099 (10−7M) in the pre-CP/CPB-ND and the pre-CP/CPB-DM subgroups; B, the coronary arteriolar contractile response to vasopressin at 10−5M in the presence or absence of SR490099 (10−7M) in the pre-CP/CPB-ND and the pre-CP/CPB-DM subgroups; C, Dose-dependent contractile response of atrial coronary arterioles to vasopressin in the presence or absence of V1 receptor blocker SR490099 (10−7M) in the post-CP/CPB-ND and the post-CP/CPB-DM subgroups; D, the coronary arteriolar contractile response to vasopressin at 10−5M in the presence or absence of SR490099 in the post-CP/CPB-ND and the post-CP/CPB-DM subgroups;*P<0.05 vs. pre-CP/CPB-ND alone or #P <0.05 vs. pre-CP/CPB-DM alone, n = 6/group, mean ± SD.