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作者通过理论分析发现了心室收缩期的最大张力、心室收缩末期压力和每搏输出量三者之间的相互关系，从而获得一种新的评价心室肌收缩力的简便方法——心室收缩末期容积－压力相关直线斜率（Ｅ＿（ｍａｘ））。用１２条狗进行实验验证，结果表明采用这种方法测得的Ｅ＿（ｍａｘ）值（０．６０±０．１６ｋＰａ／ｍｌ）与复杂方法测得的相接近；该方法重复性好，并能非常敏感地反映出心肌收缩力的变化。用该法评价心肌缺血时的心室肌收缩功能，结果显示Ｅ＿（ｍａｘ）比其他血流动学参数更有效。
Through theoretical analysis, the author found the maximum systolic ventricular tension, ventricular end-systolic pressure and stroke volume of the relationship between the three, so as to obtain a new evaluation of ventricular contractility simple method - ventricular end-systolic volume - pressure-related line slope (E_ (max)). The experimental validation of 12 dogs showed that the E max value (0.60 ± 0.16 kPa / ml) measured by this method was close to that obtained by the complex method. The method was reproducible and Very sensitive to reflect changes in myocardial contractility. Using this method to evaluate ventricular systolic function during myocardial ischemia, the results show that E max is more effective than other hemodynamic parameters.