A Simplified Approach to Predicting Reintervention in the Arterial Switch Operation.

Area of Science:

• Pediatric Cardiology
• Congenital Heart Surgery
• Cardiovascular Surgery

Background:

• Arterial switch operation (ASO) is a standard surgical repair for d-transposition of great arteries (dTGA).
• Predicting the need for reintervention after ASO is crucial for optimizing patient outcomes.
• Conventional risk factors may not fully capture the reintervention risk in all dTGA subtypes.

Purpose of the Study:

• To evaluate a simplified approach for predicting reintervention after ASO in patients with dTGA.
• To identify specific patient categories at higher risk for reintervention post-ASO.

Main Methods:

• Retrospective review of 180 consecutive patients who underwent ASO from 2009-2018.
• Patients were categorized into three groups based on anatomy: Category I (dTGA + intact VSD), Category II (dTGA + VSD), and Category III (dTGA + AAO +/- VSD/TBA).
• Kaplan-Meier estimates were used for reintervention-free survival, and multivariable analysis identified predictors of reintervention.

Main Results:

• Reintervention-free survival at 8 years was 86% for the entire cohort.
• Patients in Category III (dTGA + AAO) and Category II (dTGA + VSD) showed significantly higher risks of reintervention (HR=7.43 and HR=6.90, respectively) compared to Category I.
• Conventional risk factors like low birth weight did not predict reintervention, suggesting limitations in current predictive models.

Conclusions:

• A simplified categorization highlighting anatomical complexity is effective in predicting reintervention risk after ASO.
• Category II patients (dTGA + VSD) represent a substantial risk group for reintervention and should not be considered low-risk.
• This approach aids in risk stratification and may guide closer follow-up for high-risk dTGA patients post-ASO.