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通过理论分析发现心室收缩期的最大张力、心室收缩末期压力和每搏心输出量三者之间存在着相互关系，从而获得一种新的简便的评价心室肌收缩力的方法—心室收缩末期容积—压力相关直线斜率（Ｅｍａｘ）。用１２条狗进行实验验证，测得的Ｅｍａｘ值（０．６０±０．１７ｋＰａ／ｍｌ）与复杂方法测得的值相接近；而且重复性好，能非常敏感地反映出心肌收缩力的变化。结果表明，采用这种方法来评价心肌缺血时的心室肌收缩功能，比其他血流动力学参数更有效。因此，本方法是一种有效的评价心室肌收缩力的方法。
Theoretical analysis shows that the maximum systolic ventricular systolic pressure, ventricular end-systolic pressure and stroke volume of cardiac output there is a relationship between the three, so as to obtain a new method for the evaluation of ventricular contractility - ventricular end-systolic volume Pressure-dependent line slope (Emax). Experiments with 12 dogs demonstrated that the measured Emax (0.60 ± 0.17 kPa / ml) was close to that measured by the complex method and was reproducible with good sensitivity to reflect changes in myocardial contractility . The results show that the use of this method to assess myocardial ischemia myocardial ventricular systolic function, more than other hemodynamic parameters more effective. Therefore, this method is an effective method to evaluate contractility of ventricular muscle.