CPT® Code 33724

The procedure described by CPT® Code 33724 involves the surgical repair of isolated partial anomalous pulmonary venous return, which is a specific type of congenital heart defect. In this condition, not all four pulmonary veins return to the left atrium as they normally should; instead, some of these veins, particularly the right pulmonary veins, drain abnormally into the right side of the heart, such as the superior vena cava, right atrium, or inferior vena cava. This abnormality can lead to a situation where oxygenated blood is returned to the systemic venous side of the circulatory system rather than being properly circulated throughout the body. The condition may remain asymptomatic until middle age, making it challenging to diagnose early. The surgical approach typically involves a midline sternotomy, which allows the surgeon to access the heart directly. During the procedure, cardiopulmonary bypass is initiated to maintain circulation while the heart is manipulated. The surgeon then visualizes and dissects the anomalously draining pulmonary veins from their incorrect insertion points. The goal of the surgery is to redirect these veins so that they drain into the left atrium, restoring normal pulmonary venous return. Additionally, if there is an associated atrial septal defect, the surgeon will close this defect by suturing a patch over the hole, further improving the patient's hemodynamics and overall heart function.