Observed the effecting on parameters of left ventricular systolic function after myocardial infarction during infusion dobutamine(Dob) by pulse Doppler echocardiography.

• 应用脉冲多普勒超声心动图观察静注多巴酚丁胺（Dob）对心肌梗塞（MI）后左室收缩功能各项参数的影响。