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本文根据弹性力学原理使用超声心动图仪配合录像机、微机测量主动脉瓣关闭不全和二尖瓣关闭不全各１０例和５０例正常人瞬时左室收缩期室壁应力（每单位面积的力）一应变（每单位长度的变化）关系。结果表明：国人主动脉瓣关闭不全者左室收缩期最大心肌弹性劲度（ｍａｘＥａｖ）由正常人１１２．８±２３．５增至１３８．８±４７．３４ｋＰａ，零应力壁间小轴径（Ｄｏｍ）由正常３．９±０．５２ｃｍ增至６．０２±１．０１ｃｍ；二尖瓣关闭不全者ｍａｘＥａｖ由正常值增加至１５０．０４±３２．４５ｋＰａ，Ｄｏｍ由正常值增至５．０４±０．５４ｃｍ。ｍａｘＥａｖ和Ｄｏｍ是评估心肌收缩性变化的理想指标。本文对主动脉瓣和二尖瓣关闭不全的心肌收缩力进行了定量分析。
In this paper, according to the principle of elasticity, the echocardiograph was used in combination with VCR to measure the instantaneous left ventricular systolic wall stress (force per unit area) in 10 cases of aortic regurgitation and mitral regurgitation by computer. Strain (change per unit length) relationship. The results showed that the maximal myocardial elastic stiffness (maxEav) of Chinese people with aortic regurgitation increased from 112.8 ± 23.5 to 138.8 ± 47.34kPa, Dom) increased from normal 3.9 ± 0.52cm to 6.02 ± 1.01cm; maxEav of mitral regurgitation increased from normal to 150.04 ± 32.45kPa, Dom increased from normal to 5.04 ± 0.54cm. maxEav and Dom are ideal indicators for assessing changes in myocardial contractility. In this paper, aortic valve and mitral regurgitation myocardial contractility were quantitatively analyzed.