CPT® Code 33840

Excision of coarctation of the aorta, as described by CPT® Code 33840, refers to a surgical procedure aimed at correcting a congenital defect known as coarctation of the aorta. This condition is characterized by a narrowing of the aorta, which is the major artery responsible for distributing oxygenated blood from the heart to the rest of the body. The narrowing typically occurs between the arterial branches that supply blood to the upper body and those that supply the lower body, leading to an imbalance in blood flow. As a result, the upper body receives an increased volume of blood, while the lower body experiences reduced blood flow, which can lead to various complications if left untreated. The surgical approach to this procedure involves a posterolateral thoracotomy, which is an incision made in the chest to access the aorta. During the operation, the parietal pleura, a membrane lining the chest cavity, is incised to allow for better access to the aorta. The surgeon carefully dissects surrounding tissues to expose critical structures, including the transverse aortic arch, left subclavian artery, ligamentum or ductus arteriosus, descending aorta, and intercostal collateral vessels. To perform the excision safely, proximal and distal control of the aorta is achieved using vascular clamps, and the subclavian artery is also clamped while intercostal collaterals are managed with vessel loops. If a patent ductus arteriosus is present, it is controlled with transfixing sutures, and a stay suture is placed in the aortic isthmus before ligation. The procedure culminates in the resection of the narrowed segment of the aorta, followed by a direct end-to-end anastomosis, which connects the proximal and distal segments of the aorta. This surgical intervention is critical for restoring normal blood flow and preventing potential complications associated with untreated coarctation of the aorta.