近年来,由于治疗技术及药物的进展,冠状动脉粥样硬化性心脏病的死亡率虽有了显著的降低,但急性心肌梗塞仍严重地威胁着病人生命的安全,其中因并发重度充血性心力衰竭及心室颤动等严重心律失常而致死亡者不在少数。虽然,利尿剂、止血带结扎以及静脉切开放血术等临床习用之常规方法可降低左心室充盈压力,使充血性心力衰竭得以解除,但其心搏量亦随之减少。而在治疗某些低心排血量患者时,常给予正性收缩能作用的药物,以增强心肌收缩力或应用血浆容 In recent years, due to advances in treatment techniques and drugs, although the mortality rate of coronary heart disease has been significantly reduced, but acute myocardial infarction is still a serious threat to the safety of patients with life, which due to severe congestive heart failure Failure and ventricular fibrillation and other serious arrhythmic deaths are numerous. Although diuretics, tourniquet ligation and venous bloodletting and other routine clinical practice can reduce left ventricular filling pressure, so that congestive heart failure can be lifted, but its stroke volume also will be reduced. In the treatment of some patients with low cardiac output, often given positive systolic effect of drugs to enhance myocardial contractility or plasma volume