结论面积变化率的测量有助于评估asd患者右心室功能，并可全面掌握ASD大小，有利于临床医生进行ASD封堵或手术。
Conclusions the measurement of area change percentage is helpful to learn the RV function in ASD patients and the size of ASD which was beneficial to ASD occlusion or operation.
心尖四腔切面面积—长度法计算右心室容积及射血分数。
The right ventricular volume was calculated with plane area length method.
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