The regurgitant volume (RV) and regurgitant fraction (RF) calculated by two dimensional pulsed Doppler (2D-PD) method were served as reference values.
在二维超声心动图上用脉冲多普勒（PD-2D）测量计算反流容积（RV）和反流分数（RF% ）。
The regurgitant volume (RV) and regurgitant fraction (RF) calculated by two dimensional pulsed Doppler (2D-PD) method were served as reference values.
在二维超声心动图上用脉冲多普勒（PD-2D）测量计算反流容积（RV）和反流分数（RF% ）。
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