Fig 4. Perpendicular stand of the inflow and outflow tract planes (80°-90°).

Blood from both inflow tracts enters both outflow tracts, leading to maximum mixture of deoxygenated and oxygenated blood. The depicted heart has a discordant ventriculoarterial connection, meaning the pulmonary trunk is connected to the morphologically left ventricle and the aorta is connected to the morphologically right ventricle and communicates with the morphologically left ventricle via the ventricular septal defect. The angle in this specific heart was 90°. Ao: Aorta; AV: atrioventricular valve; PT: pulmonary trunk; VSD: ventricular septal defect; Ao = Aorta. Blue: deoxygenated blood, red: oxygenated blood, purple: mix of deoxygenated and oxygenated blood.