Mitral insufficient grades were determined by the effective regurgitant orifice area measured with spectral Doppler.
2
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.
3
采用缝隙式出流口时产生漩涡的临界高度比采用同面积的圆形出流口时的低得多。
Using slit outlet, the critical height of vortex sink is substantially lower than that of the round outlet used when the area of outlet and flow are equal.
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