左区能显示整个左室、左房的大小，二尖瓣的形态与对合情况，二尖瓣脱垂者可见叶瓣游离缘处某一区域向左房脱出。
In left area the contour and size of the left ventricle and left atrium and the shape and coaptation of the mitral valve could be visualized.
目的进一步探讨双孔成形技术治疗二尖瓣前叶脱垂的临床可行性。
Objective: To evaluate the clinical effect of the double-orifice technique in the treatment of the anterior leaflet prolapse of mitral valve.
结果收缩期脱垂的二尖瓣表面粗糙并向左房膨出，可伴有腱索异常。
Results The surfaces of the prolapsed mitral valves showed rough and accompanied with abnormal tendinous chordae , and their bodies projected into left atrium during systole.
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