Abstract
The pulmonary atresia with ventricular septal defect was observed in 11 (1.93%) of 570 bovine hearts showing congenital cardiovascular anomalies. In all cases the infundibulum of the right ventricle was hypoplastic and the pulmonary valvular level was atretic. The pulmonary trunk was a blind cord in seven cases, in remaining four cases the trunk was patent but its diameter was smaller than the left and right pulmonary arteries. All cases had left and right pulmonary arteries, and the arteries were confluent and supplied by a patent ductus arteriosus within the pericardial cavity.
