运用 M 型超声心动图对13例经手术证实为室上嵴型单纯性室间隔缺损在0.5～2cm的病儿进行心功能测定。结果说明,室间隔缺损患儿虽然临床无明显心衰表现,而左心功能已有轻度改变。测定左室舒张末径/右室舒张末径(LVEDd/RVEDd)比值,发现其值增大与室间隔缺损大小成正比例关系,认为可以将 LVEDd/RVEDd 比值作为预测室问隔缺损左向右分流量大小的指标。 M-mode echocardiography was used to evaluate the cardiac function of 13 children who were surgically diagnosed as supraventricular ridge-type ventricular septal defect with a diameter of 0.5 ~ 2cm. The results show that although children with ventricular septal defect did not show clinical manifestations of heart failure, and left ventricular function has been mild changes. Measured left ventricular diastolic diameter / right ventricular diastolic diameter (LVEDd / RVEDd) ratio and found that the value increases and the size of ventricular septal defect is proportional to the proportion that the LVEDd / RVEDd ratio can be used as a prediction of atrial septal defect left to right Flow size indicators.