Bartusevich E V, Roshchevskaia I M
Ross Fiziol Zh Im I M Sechenova. 2011 Sep;97(9):939-43.
The echocardiographic research of the left ventricular has revealed heterogeneity of thickness of the posterior wall and interventricular septum in three parallel planes in the transverse direction of the left ventricle in calves. The amplitude of systolic motion of the left ventricle posterior wall is larger than that of the interventricular septum at the level of the mitral valve, at the level of the papillary muscles, and at the apical level. The excursion of left ventricular walls in the basal level is twice as large as the mobility of ventricular walls in the apical level. During the contraction of the myocardium, the shortness of the left ventricular transversal diameter is to great extent determined by the degree of contraction of the left ventricular wall rather than of the interventricular septum. The high contractility is revealed in calves.
对小牛左心室的超声心动图研究显示，在左心室横向的三个平行平面中，后壁和室间隔厚度存在异质性。在二尖瓣水平、乳头肌水平和心尖水平，左心室后壁的收缩运动幅度大于室间隔。左心室壁在基部水平的偏移量是心尖水平心室壁移动量的两倍。在心肌收缩期间，左心室横向直径的缩短在很大程度上取决于左心室壁而非室间隔的收缩程度。小牛表现出高收缩性。
