CPT® Code 33870

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The procedure described by CPT® Code 33870 involves the surgical repair of a transverse arch aortic aneurysm using a graft, while the patient is placed on cardiopulmonary bypass. A transverse arch aortic aneurysm refers to a dilation or bulging in the aorta, specifically in the section that curves over the heart. This condition can lead to serious complications, including rupture or dissection, necessitating surgical intervention. During the procedure, access to the heart is achieved through a median sternotomy, which involves making an incision along the sternum to open the chest cavity. The right subclavian and right femoral arteries are cannulated to facilitate the establishment of cardiopulmonary bypass, allowing for the heart and lungs to be temporarily taken over by a machine that oxygenates the blood and circulates it throughout the body. This is crucial for maintaining blood flow and oxygen delivery while the surgical team repairs the aorta. The procedure includes the mobilization of the aortic arch and its branches, transection of the aorta, and replacement of the diseased section with a graft. Depending on the technique used, either an en bloc or separated graft method is employed to reconstruct the aortic arch and its branches, ensuring proper blood flow to the brain and upper body. The complexity of this procedure underscores the need for meticulous surgical technique and careful postoperative management to ensure patient safety and recovery.