CPT® Code 33694

The procedure described by CPT® Code 33694 involves a complete surgical repair of tetralogy of Fallot (TOF) in neonates, specifically when a transannular patch is utilized. Tetralogy of Fallot is a complex congenital heart defect characterized by four primary abnormalities: pulmonary stenosis, which is a narrowing that obstructs blood flow from the right ventricle to the pulmonary artery; right ventricular hypertrophy, which is the thickening of the right ventricular walls due to increased pressure; ventricular septal defect (VSD), which is a hole in the wall separating the heart's lower chambers; and overriding aorta, where the aorta is positioned directly over the VSD, allowing mixed blood flow. In some cases, pulmonary atresia may also be present, leading to a complete blockage of blood flow from the right ventricle to the pulmonary artery. The surgical approach typically involves a median sternotomy to access the heart, followed by the establishment of cardiopulmonary bypass and cardioplegic arrest to protect the heart during the procedure. The VSD is repaired using a synthetic patch, which helps to correct the position of the aorta and prevent the mixing of oxygenated and deoxygenated blood. Additionally, the pulmonary valve is addressed by resecting obstructive tissue, and if necessary, a transannular patch is placed to enlarge the outflow tract. In cases where pulmonary atresia is present, a conduit is created to facilitate blood flow from the right ventricle to the pulmonary artery. This comprehensive repair aims to restore normal blood flow and improve the overall function of the heart in affected neonates.