Schematic representation (LA = Left atrium; LV = Left ventricle; AO = Aorta; PV = Pulmonary valve; PT = Pulmonary trunk; RA = Right atrium; RV = Right ventricle; SVC = Superior vena cava; IVC = Inferior vena cava). The opened up chambers of the heart show a communication in the inter-ventricular septum superiorly (white arrow).