CPT® Code 33660

Repair of incomplete or partial atrioventricular canal (ostium primum atrial septal defect), with or without atrioventricular valve repair

The procedure described by CPT® Code 33660 involves the surgical repair of an incomplete or partial atrioventricular canal, specifically known as an ostium primum atrial septal defect. This condition is a type of atrioventricular septal defect (AVSD), which is characterized by a defect in the heart's septum that separates the atria and ventricles. The endocardial cushions, which are embryonic structures, play a crucial role in the development of the heart's central structures, including the atrial and ventricular septa, as well as the tricuspid and mitral valves. In cases of partial AVSD, there is a partial filling of the ventricular septum with tissue, leading to the formation of two distinct atrioventricular valves. The surgical procedure typically requires a median sternotomy to access the heart, followed by the establishment of cardiopulmonary bypass to facilitate the repair. The operation includes inspecting and repairing the tricuspid and mitral valves, closing the atrial septal defect, and ensuring the overall competence of the heart valves to prevent future complications. This procedure is critical for restoring normal heart function and preventing further cardiac issues associated with AVSD.