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1·In the direct coaptation group the radial nerve was cut at that level and sutured directly.

将桡神经前臂支于背阔肌止点下缘处切断再原位缝合，此组作为对照组。

2·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.

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。