...学术期刊 rgitant volume, RV）、返流分数（regurgitant fraction, RF）和有效返流口面积（effective regurgitant orifice area, EROA）。
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二尖瓣关闭不全程度用频谱多普勒测定的有效返流口面积确定。
Mitral insufficient grades were determined by the effective regurgitant orifice area measured with spectral Doppler.
提出了稳定流量精度的计算公式以及变节流口过流面积的计算公式；
The formulas for calculating the precision of priority flow and the area passed by divided flow are given.
目的探讨二尖瓣狭窄伴反流的患者用压差减半时间(pht)法测量二尖瓣口面积的应用价值。
Objective To explore the clinical application of pressure half-time (PHT) method on rheumatic mitral stenosis coexisting mitral regurgitation.
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