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二尖瓣正常关闭时不发生反流的机理尚不清楚,可能与心房、心室顺序收缩的协调性有关。急性主动脉瓣反流(AR 时,左室舒张压迅速升高,至舒张中晚期时压力常已超过左房压,从而导致二尖瓣的收缩期前关闭。此前没有心房收缩,也不伴有同时的心室收
The mechanism by which no mitral regurgitation occurs when the mitral valve is normally closed is not known and may be related to the coordination of atrial and ventricular contractions. Acute aortic regurgitation (AR, the rapid increase in left ventricular diastolic pressure, diastolic pressure in the late diastolic pressure often exceeds the left atrial pressure, resulting in the closure of the mitral valve before the systole. There was no previous contraction of the heart, nor with Have simultaneous ventricular closure