本文对30只家兔的心阻抗一阶和二阶微分图进行了分析,家兔一阶微分图中有A、C、O波和B点,二阶微分图中有a、c、o波和b、p、x、k、f点。但是家兔的b-p间期(快速射血期)比p-x间期(缓慢射血期)长,k-f间期(快速充盈期)比f-a间期(缓慢充盈期)长。结扎冠状动脉前降枝(中上1/3处)和注射垂体后叶素(0.5u/kg)后,阻抗法测定的心收缩间期和心舒间期指标均出现明显改变,结扎冠状动脉组更为显著。注射异丙基肾上腺素(2.5mg/kg)24小时后,仅有心舒间期指标出现异常。三种实验性急性心肌缺血均能使二阶微分图中的正向a波(a′)增大,注射垂体后叶素后10分钟,心电图ST段已复位,但增大的正向a波仍然存在,提示正向a波能够灵敏地反映心脏功能的异常改变。 In this paper, the first and second order differential graphs of heart impedance were analyzed in 30 rabbits. There are A, C, O and B points in the first-order differential graph of rabbits and a, c, o waves in the second-order differential graph And b, p, x, k, f points. However, the rabbit’s b-p interval (fast ejection period) was longer than the p-x interval (slow ejection period), and the k-f interval (rapid filling period) was longer than the f-a interval (slow filling period). Ligation of the anterior descending coronary artery (1/3 in the top) and injection of vasopressin (0.5u / kg), impedance measured by the systolic and inter-systolic and diastolic parameters were significantly changed, ligation of the coronary artery Group more significant. After injection of isoproterenol (2.5 mg / kg) for 24 hours, only signs of cardiac arrest were abnormal. Three kinds of experimental acute myocardial ischemia can make positive a-wave (a ’) in second-order differential graph increase, 10 minutes after pituitrin injection, ST segment of electrocardiogram has been reset, but increased positive a Waves still exist, suggesting that positive a-wave can sensitively reflect abnormal changes in cardiac function.