[Reoperation for late postoperative right ventricular outflow tract obstruction]

Area of Science:

• Pediatric Cardiac Surgery
• Congenital Heart Disease
• Cardiovascular Physiology

Context:

• Critical stenosis of the right ventricular outflow tract (RVOT) often requires re-operation in pediatric patients.
• Previous surgical interventions like extracardiac conduits or patch reconstructions may fail, necessitating further surgical management.
• Complex congenital heart diseases such as tetralogy of Fallot, transposition of the great arteries, and truncus arteriosus communis are common indications.

Purpose:

• To evaluate the efficacy and outcomes of re-operation for critical RVOT stenosis in pediatric patients.
• To assess the impact of surgical reconstruction on hemodynamic parameters and right ventricular function.
• To determine the optimal timing for re-operation to minimize risks and maximize functional improvement.

Summary:

• Eighteen pediatric patients (mean age 7.9 years) with critical RVOT stenosis underwent re-operation using various reconstruction techniques including monocusp patches and valved pericardial rolls.
• The study reported no early mortality, with one late death due to arrhythmia. Significant improvements were observed in RVOT pressure gradients, right ventricular systolic pressure, and RV to systemic pressure ratios (p < 0.001).
• Post-re-operation, right ventricular end-diastolic volume index and ejection fraction showed significant improvement (p < 0.05 and p < 0.005, respectively), indicating enhanced cardiac function.

Impact:

• Re-operation for RVOT stenosis is a safe and effective procedure in pediatric patients, leading to significant hemodynamic and functional improvements.
• The findings underscore the importance of timely surgical intervention before the onset of irreversible right ventricular dysfunction.
• This study provides valuable insights for surgical strategies and patient selection in managing complex congenital heart defects requiring repeat interventions.