An alternative classification emphasizes etiology: regurgitant murmurs from semilunar insufficiency versus ventricular f另一种分类则着重于其病因：由半月瓣闭锁不全所致的回流性杂音对心室充盈性杂音。
They measured the effectie regurgitant orifice and ealuated indices of mitral deformation, including systolic alular ten他们评价了返流时有效的二尖瓣口大小和二尖瓣异形程度，包括收缩期瓣膜的展开及二尖瓣的收缩。