The objective is to explore the roles of color Doppler vena contracta in the evaluation of mitral regurgitation grading.
目的是探讨彩色多普勒静脉收缩术在评估二尖瓣反流分级中的作用。
Objective: To explore the roles of color Doppler vena contracta in the evaluation of mitral regurgitation grading.
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。
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