CPT® Code 33732

The procedure described by CPT® Code 33732 involves the surgical repair of cor triatriatum or a supravalvular mitral ring through the resection of the left atrial membrane. Cor triatriatum, also known as cor triatriatum sinister, is a congenital heart defect where the left atrium is divided into two chambers by a membrane, which can impede normal blood flow. This condition results in the pulmonary veins draining into the upper chamber, leading to potential complications in blood circulation. On the other hand, a supravalvular mitral ring is characterized by an abnormal ridge of tissue located on the atrial side of the mitral valve, which can also restrict blood flow from the left atrium to the left ventricle. The surgical approach typically involves accessing the heart through a median sternotomy or thoracotomy, allowing the surgeon to perform the necessary repairs. The procedure requires the establishment of cardiopulmonary bypass and the initiation of cardioplegic arrest to protect the heart during surgery. The left atrium is then incised to excise the obstructive tissue, whether it be the membrane in cor triatriatum or the ring in supravalvular mitral ring. If the mitral valve requires repair or replacement, this may be addressed in a separate procedure. Following the surgical intervention, the patient is gradually weaned off cardiopulmonary bypass, and any necessary chest tubes are placed before closing the chest incision.