目的 :探讨利用多普勒超声心肌作功指数评价左室功能的价值。方法 :急性心肌梗死患者 72例 ,其中 Killip分级 - 级 5 4例 , - 级 18例 ,正常对照组 44例。测定左室射血分数 ( EF)、每搏量 ( SV)、心脏指数 ( CI)、射血前期 /射血时间 ( PEP/ ET)、等容舒张期 ( IRT)、等容收缩期 /射血时间 ( ICT/ ET)及心肌作功指数( MPI)。 MPI=( ICT+IRT) / ET,由二尖瓣关闭至开放时间减去 ET所得值再除以 ET而得。结果 :MPI对照组为0 .49± 0 .0 8,Killip分级 - 级组为 0 .6 8± 0 .14, - 级组为 1.0 0± 0 .19,各组间均具有显著性差异 ( P<0 .0 1)。 MPI与心率无关。结论 :MPI是综合评价左室收缩和舒张功能的简便而准确可信的多普勒超声新指标 Objective: To evaluate the value of Doppler echocardiography in assessing left ventricular function. Methods: A total of 72 patients with acute myocardial infarction were enrolled in this study. Killip grade was 54 cases, grade 18, and normal control group, 44 cases. The left ventricular ejection fraction (EF), stroke volume (SV), cardiac index (CI), ejection duration / ejection time (PEP / ET), isovolumic relaxation (IRT), isovolumic systolic / Blood time (ICT / ET) and myocardial work index (MPI). MPI = (ICT + IRT) / ET, the time from mitral valve closure to open time minus the value of ET divided by ET. Results: The MPI control group was 0 .49 ± 0. 0 8, Killip grade - grade group was 0.68 ± 0.14, - grade group was 1.0 0 ± 0.19, there was significant difference among the groups ( P <0 .0 1). MPI has nothing to do with heart rate. Conclusion: MPI is a simple, accurate and credible new index of Doppler ultrasound for comprehensive evaluation of left ventricular systolic and diastolic function