Angiographic Demonstration of Intramyocardial Sinusoids in Pulmonary-Valve Atresia with Intact Ventricular Septum and Hypoplastic Right Ventricle

WHEN the semilunar valve is atretic and the ventricular septum is intact the related ventricle must generate unusually high systolic pressures. The only points of egress from such a ventricle are through a regurgitant atrioventricular valve and abnormal intramyocardial sinusoids that lead from the cavity of the ventricle deep into the myocardial wall. These sinusoids have previously been reported in autopsy material in pulmonary-valve atresia with intact ventricular septum by Grant1 and by Williams, Kent and Edwards2 and in aortic atresia with intact ventricular septum by Bellet and Gouley.3 In these pathological studies the abnormal sinusoids were seen to communicate . . .