Objective: To investigate the way on how to accurately measure the ratio of pulmonary flow to systemic blood flow (Qp/Qs). Methods: In 24 cases of congenital heart disease,the Qp/Qs by the combination of velocity time integral (VTI) and the pulmonary and aortic valve annulus area (Echo A) or diameters (Echo D) measured with echocardiography was compared with the Qp/Qs obtained from cardiac catheterization. Results: Qp/Qs obtained from Echo A was highly correlated with that of cardiac catheterization (r=0.92,P<0.001),while result of Echo D was less closely correlated with that of cardiac catheterization (r=0.68,P<0.01). Conclusion: It is an accurate way to calculate Qp/Qs by combining pulmonary and aortic valve annulus area measured by echocardiography with VTI.
蒋国平, 康曼丽, 何瑾, 夏呈森, 朱卫华. 超声直接测量小儿肺循环和体循环流量比值[J]. 浙江大学学报（医学版）, 1999, 28(3): 120-122.
Jiang Guoping, Kang Manli, He Jin. Direct Measurement of the Ratio of Pulmonary Flow to Systemic Blood Flow Among Children by Echocardiography. Journal of ZheJiang University(Medical Science), 1999, 28(3): 120-122.