Repair of Partial and Transitional Atrioventricular Septal Defects: Mid-term Outcomes in a Single-center Cohort.

Background: Surgical repair of partial and transitional atrioventricular septal defects (AVSDs) aims to achieve optimal outcomes with minimal need for reintervention. This study aimed to evaluate the mid-term outcomes of AVSD repair in both pediatric and adult populations. Methods: We retrospectively reviewed all patients who underwent surgical repair for partial or transitional AVSDs at our center between January 2019 and December 2022. Key outcomes, including mortality, reoperation, and atrioventricular valve (AVV) repair strategies, were assessed during follow-up. Results: A total of 136 patients were included (partial AVSD, n = 100; transitional AVSD, n = 36), with a median follow-up of 50.5 months. The median hospital stay was 14 days. No early or late deaths occurred. Reoperation was required in four patients (2.9%); all reoperations included left atrioventricular valve (LAVV) reoperation. However, reoperation rates did not differ significantly between AVSD subtypes ( Conclusions: Surgical repair of partial and transitional AVSDs results in excellent mid-term survival and a low reoperation rate across both pediatric and adult patients. Continued refinement of AVV repair strategies remains essential to reduce the risk of LAVV reintervention and prevent left ventricular outflow tract obstruction. Long-term follow-up is warranted to improve the evaluation of the durability of techniques such as suture annuloplasty and ring annuloplasty.