Objective To evaluate the effects of postconditioning on ECG in patients undergoing heart valve replacement patients under CPB.Methods Forty NYHA ⅡorⅢ,ASA Ⅱ orⅢ patients of both sexes,aged21-59 years,scheduled for cardiac valve replacement,were divided into two groups(n=20 in each):control group(C group)and postconditioning(I-postC)group(P group).In P group,the procedure involved 5 min before opening the ascending aorta,aortic unclamping for 30 s,and cross-clamping for 30 s for three cycles,after which the ...
aorta was completely opened.C group was not treated.The changes of ECG in C and P groups were recorded at thetime points of after anesthesia(T1),heart rebeating(T2),10 min after aortic declamping(T3),30 min after aortic体外循环(cardiopulmonary bypass,CPB)