Abstract
The hemodynamic alterations revealed by cineangiocardiography in 53 cases of patent ductus arteriosus made possible the correct angiocardiographic diagnosis in 90 per cent of the cases. The most constant functional sign is "blanching of the pulmonary artery," which is seen during diastole and consists of a decrease in density of the pulmonary artery and its branches. This phenomenon has been analyzed by projecting the cineangiocardiograms frame by frame and measuring angiographic density and diameter at the same points of the pulmonary artery. The curves obtained were correlated with each other and plotted against time. The findings were correlated with clinical, surgical, and pathologic information. The hemodynamics of the shunt in patent ductus arteriosus are discussed and a theoretical explanation is offered.
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