Detection of circulatory shunts by means of external counting method Differentiation between ASD and VSD,Semiquantitave Estimation of Left-to-Right Shunt,and the Detection of Right-to-Left Shunt

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  • Detection of Circulatory Shunts by Means of External Counting Method Differentiation between ASD and VSD, Semiquantitative Estimation of Left-to-Right Shunt, and the Detection of Right-to-Left Shunt

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1). Isotope dilution curves were obtained in 51 patients with left-to-right shunt. 2) As the cardiac dilution curve for ASD had a characteristic pattern, ASD was able to be differentiated from VSD by means of the dilution curve. 3) K·BT·10-1 of the pulmonary vascular dilution curve was represented as an index of the presence of the left-to-right shunt. 4) C2/C1 of the pulmonary vascular dilution curve was increased in proportion to the magnitude of the left-to-right shunt rate. 5) It was easy to detect the presence of the right-to-left shunt, using the 131I-MAA.

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