33781

Aortic root enlargement with ventricular septal defect patch and right ventricular outflow tract reconstruction

The Rastelli procedure (and analogous surgical interventions denoted by this specific code) is a major, highly complex open-heart surgical operation performed to correct severe congenital cardiac anomalies, most notably dextro-Transposition of the Great Arteries (d-TGA) when it is anatomically complicated by a large Ventricular Septal Defect (VSD) and severe Left Ventricular Outflow Tract Obstruction (LVOTO), frequently presenting as subvalvular pulmonary stenosis. The primary objective of the procedure is to re-establish physiological, normal anatomical blood circulation by rerouting the left ventricle to the aorta using a synthetic intracardiac baffle (patch) through the VSD, and simultaneously connecting the right ventricle to the pulmonary artery utilizing an extracardiac valved conduit. During the procedure, a median sternotomy is performed, and cardiopulmonary bypass is initiated to allow for cardiac arrest and a bloodless surgical field. A right ventriculotomy provides the necessary internal exposure. An intracardiac tunnel or baffle is meticulously constructed using a synthetic patch (such as Dacron or polytetrafluoroethylene) to bridge the left ventricle, through the existing VSD, directly to the aortic valve. This crucial step effectively closes the VSD while committing oxygenated left ventricular blood to the systemic circulation. To achieve a completely unobstructed systemic pathway, the VSD may require significant enlargement; this involves resecting portions of the anterosuperior conal septum, effectively providing aortic root enlargement. The native pulmonary valve is typically oversewn or permanently ligated to prevent systemic blood from inadvertently entering the pulmonary circulation, completely bypassing the native subpulmonary stenosis. Following the intracardiac reconstruction, the right ventricular outflow tract (RVOT) must be rebuilt. An extracardiac valved conduit (such as a cryopreserved homograft or a synthetic valved tube graft) is anastomosed distally to the main pulmonary artery or its major bifurcation, and proximally to the right ventriculotomy site. This establishes a clear, competent pathway for deoxygenated right ventricular blood to reach the lungs. Because the extracardiac conduit utilized during the reconstruction is of a fixed size and does not grow with the pediatric patient, it is prone to progressive structural valve degeneration, calcification, or relative stenosis as the child develops. Consequently, patients undergoing this procedure will almost universally require subsequent reoperations for conduit replacement in later childhood, adolescence, or early adulthood, mandating lifelong specialized cardiologic surveillance.

Clinical Indications

  • Dextro-transposition of the great arteries (d-TGA) complicated by a substantial ventricular septal defect (VSD).
  • Left ventricular outflow tract obstruction (LVOTO), commonly manifesting as severe subvalvular pulmonary stenosis, rendering the patient unsuitable for a standard Arterial Switch Operation (ASO).
  • Double outlet right ventricle (DORV) presenting with pulmonary stenosis and anatomically committed VSD requiring intracardiac baffling.
  • Complex variants of truncus arteriosus or severe forms of tetralogy of Fallot requiring complete right ventricular outflow tract reconstruction and extensive root modification.

Procedure Steps

  1. The patient is placed under general endotracheal anesthesia, prepped, and draped in a sterile fashion.
  2. A standard median sternotomy is performed to fully expose the mediastinum and the heart.
  3. Aortic and bicaval cannulation is performed to institute cardiopulmonary bypass.
  4. The aorta is cross-clamped, and antegrade/retrograde cardioplegia is administered to achieve complete diastolic cardiac arrest.
  5. A right ventriculotomy is created to gain precise visualization of the intracardiac structures, including the VSD, aortic valve, and pulmonary outflow tract.
  6. The pulmonary valve is permanently oversewn or the main pulmonary artery is ligated to separate the left ventricle from pulmonary circulation.
  7. If the VSD is restrictive, an enlargement is performed by safely resecting the anterosuperior conal septum (aortic root enlargement) to prevent postoperative LVOTO.
  8. A synthetic intracardiac baffle (patch) is carefully sized and sutured into place, routing blood from the left ventricle through the VSD directly into the ascending aorta.
  9. The right ventricular outflow tract (RVOT) is reconstructed using an appropriately sized extracardiac valved conduit (homograft or synthetic graft).
  10. The distal end of the extracardiac conduit is anastomosed to the pulmonary artery bifurcation, and the proximal end is sutured to the right ventriculotomy defect.
  11. The heart is thoroughly de-aired, the aortic cross-clamp is released, and normal sinus rhythm is restored.
  12. The patient is systematically weaned from cardiopulmonary bypass, decannulated, protamine is administered for heparin reversal, and the sternotomy is closed in layers.

Coding Guidelines

  • Do not separately report VSD closure codes (e.g., 33681) as the placement of the intracardiac baffle through the VSD is an inherent and integral component of this procedure.
  • The reconstruction of the right ventricular outflow tract (RVOT) using an extracardiac conduit is included in the base code; do not append separate codes for the initial conduit placement.
  • Cardiopulmonary bypass is considered a standard component of this major cardiovascular procedure and should not be billed or reported separately.
  • If extensive adhesions from prior palliative surgeries (e.g., prior Blalock-Taussig shunts or pulmonary artery banding) severely complicate the procedure and significantly extend operative time, consider utilizing Modifier 22 with robust operative report documentation.
  • Future procedures performed strictly for the replacement of the extracardiac conduit due to patient growth or conduit degeneration are billed using distinct conduit replacement codes, not this primary repair code.

Associated ICD-10 Codes