研究提示临床超声诊断瓣膜返流时，在返流速度范围较小的条件下，彩色多普勒返流面积具有一定半定量诊断意义；
The study indicated that in the clinical application of color Doppler valve regurgitation, color Doppler jet area has a certain semiquantitative value with a small range of jet velocity.
其强度提示瓣膜泄漏面积、胸腔声学特征、及穿过瓣膜的压力差异。
The intensity of the murmur reflects the size of the valvular leak, the acoustic properties of the chest, and the pressure difference across the valve.
各类瓣膜的有效开口面积差异较大，其不匹配发生率亦不相同。
Valves of various types can have very different indexed effective orifice areas, so the incidence of mismatch also varies.
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