1First Department of Surgery, Osaka University Medical School, 2Department of Radiology, Osaka University Medical School, 3Department of Pediatrics, Osaka University Medical School
Single ventricle, Total cavopulmonary shunt operation, Pulsed Doppler echocardiography
Pulsed Doppler technique was utilized to determine the characteristics of blood flow pattern in two patients with single ventricle after total cavopulmonary shunt (TCPS) operation. Pulmonary arterial (PA) blood flow pattern was biphasic forward flow, similar to pulmonary venous one. In the azygos or hemiazygos vein, blood flow pattern was nearly continuous steady flow. In one patient, the ventricular inflow pattern consisted of two phasic patterns, namely rapid filling and atrial augmentation, as observed in normal subjects. PA blood now pattern was biphasic in the patients with no pumping chamber in the right heart circulation after TCPS operation. This may be partly due to the contraction and relaxation of the left atrium and ventricle.