CPT® Code 33730

The CPT® Code 33730 refers to the complete repair of total anomalous pulmonary venous return (TAPVR), which is a congenital heart defect characterized by an abnormal connection of the pulmonary veins. In a normal anatomical configuration, the pulmonary veins should drain oxygenated blood from the lungs into the left atrium of the heart. However, in TAPVR, all four pulmonary veins drain into the right atrium through an abnormal connection, leading to inadequate oxygenation of the blood and various clinical complications. TAPVR is classified into three types based on the location of the abnormal connection: supracardiac, intracardiac, and infracardiac. In supracardiac TAPVR, the pulmonary veins connect to a vertical vein that drains into the innominate vein, which subsequently empties into the superior vena cava and then into the right atrium. Intracardiac TAPVR involves the pulmonary veins draining directly into the right atrium or through the coronary sinus, which is responsible for returning blood from the heart muscle itself back to the right atrium. In infracardiac TAPVR, the pulmonary veins connect to the hepatic veins, which drain into the inferior vena cava before reaching the right atrium. All patients with TAPVR also present with an atrial septal defect (ASD), which is a hole in the wall separating the left and right atria. The surgical procedure to repair TAPVR typically involves accessing the heart through a midline sternotomy or a left anterolateral thoracotomy, establishing cardiopulmonary bypass, and initiating cardioplegic arrest to protect the heart during surgery. The repair process involves severing the abnormal connections and redirecting the pulmonary veins to the left atrium, as well as addressing the associated ASD. This complex procedure is critical for restoring normal blood flow and improving oxygenation in affected patients.