Children suffering from univentricular hearts should undergo Fontan procedure. The entire Fontan procedure involves channelizing venous blood from the SVC and IVC to the pulmonary arteries.

In this case, the blood is not required to be passed through morphologic right ventricle.
Fenestration closure post Fontan surgical procedure is performed to close the hole between the heart and the tunnel that is responsible for carrying oxygen-poor blood to the lungs from several parts of the body.

ontan procedure is carried out in catheterization laboratory. A modified Fontan procedure is done by connecting the superior vena cava with the pulmonary artery, while the inferior vena cava is connected to the right PA. Fontan operation is done in children 2 to 5 years of age.