Figure 4: Echocardiography in a patient with pulmonary atresia-intact ventricular septum. (a) Apical 4-chamber view demonstrating tripartite right ventricle with an adequate cavity. (b) Parasternal short-axis view demonstrating membranous pulmonary atresia with no antegrade pulmonary flow (only patent ductus arteriosus supply). (c) Subcostal sagittal view demonstrating membranous pulmonary atresia. (d) Apical 5-chamber view demonstrating antegrade pulmonary blood flow after pulmonary valve perforation and balloon pulmonary valvotomy