Janz R F
Fed Proc. 1980 Feb;39(2):183-7.
A survey was conducted of methods of assessing stress in the left ventricle. Although simultaneous measurements have been made of average wall force and thickness in the dog left ventricle (from which stress can be computed), the experimental procedures are not applicable to man. However, two mathematical models based on ellipsoidal representations of ventricular geometry have been shown to predict average circumferential stress reasonably well. Although both of these models are sensitive to errors in average equatorial wall thickness, they appear to be the most reliable models currently available for estimating stress. One of these models was applied to an analysis of midwall equatorial fiber stress and force in the normal conscious dog left ventricle. It was found that variations in chamber eccentricity during systole were much less important in evaluating this stress than variations in the ratio of equatorial wall thickness to semi-minor radius. A formula was derived that relates fiber stress to fiber force. It was found that fiber stress and force decrease more rapidly during ejection than intraventricular pressure, consistent with previous results.
一项关于评估左心室压力方法的调查展开了。尽管已经对狗的左心室平均壁力和厚度进行了同步测量（由此可以计算压力），但这些实验程序不适用于人类。然而，基于心室几何形状椭圆表示的两个数学模型已被证明能够较好地预测平均周向应力。尽管这两个模型对平均赤道壁厚度的误差都很敏感，但它们似乎是目前可用于估计压力的最可靠模型。其中一个模型被应用于对正常清醒狗左心室中壁赤道纤维应力和力的分析。结果发现，在评估这种应力时，收缩期心室偏心度的变化比赤道壁厚度与半短半径之比的变化重要性要小得多。推导出了一个将纤维应力与纤维力相关联的公式。结果发现，在射血过程中，纤维应力和力比心室内压下降得更快，这与之前的结果一致。
