Movements of the Mitral Valve
Movements of the Mitral Valve
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二尖瓣的运动
作者：
R. F. Rushmer;Bliss L. Finlayson;Alden A. Nash
完整犬二尖瓣运动的荧光电影摄影分析提供了证据，证明在整个心动周期中，除快速充盈期外，通过腱索施加的张力抑制了瓣尖的运动。在心室收缩开始时，乳头肌的早期收缩可能在二尖瓣尖瓣对合中起重要作用。在心室射血期间，二尖瓣尖和瓣膜环向心尖移动。在二尖瓣关闭期间，瓣尖分离非常轻微。术后即刻，当心脏比正常小得多时，在快速心室充盈期间观察到瓣膜甩宽。
Cinefluorographic analysis of mitral valve motion in intact dogs provided evidence that the motility of the valve cusps is restrained by tension exerted through the chordae tendineae throughout the cardiac cycle, except for the rapid filling phase. At the onset of ventricular systole, early contraction of the papillary muscles may play an important role in approximating the mitral valve cusps. During ventricular ejection, the mitral cusps and valve ring move toward the apex of the heart. During diastole, separation of the valve cusps is remarkably slight. The valves were observed to fling wide during rapid ventricular filling when the heart was much smaller than normal, immediately after surgery.