目的：探讨彩色多普勒过返流口宽度在估测二尖瓣返流程度中的作用。

Objective: To explore the roles of color Doppler vena contracta in the evaluation of mitral regurgitation grading.

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目的：通过超声心动图评价二尖瓣器形态改变与二尖瓣返流程度之间的关系及其临床意义。

Objective to probe the value of mitral annulus peak systolic flow velocity and systolic displacement in evaluating left ventricular systolic function of dilated cardiomyopathy patients.

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IS CM组的二尖瓣返流程度明显重于omi组，其他瓣膜的返流情况也是IS CM组严重。

Mitral and other valvular regurgitation were significantly more severe in group ISCM than group OMI.

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