Through Tricuspid Closure for Doubly Committed Subarterial Ventricular Septal Defect with Right Vertical Subaxillary Mini-incision: A Matched-Pair Analysis

Abstract

To evaluate the feasibility and efficacy of the right subaxillary vertical mini-incision (RAVI) used for the closure of doubly committed subarterial ventricular septal defect (SAVSD) through tricuspid approach only. From June 2015 to September 2016, 32 SAVSD patients (mean age 2.4 ± 1.9 years, range 0.7–8 years) underwent surgical repair with either RAVI (incision length 3-4 cm) through tricuspid (group A, n = 16) or conventional median sternotomy incision through the main pulmonary artery approach (group B, n = 16). A retrospective 1:1 matched-pair analysis was performed with the group B matched for defect size, body weight, gender, patching, and operation year. The demographic characteristics in both groups were similar. No patient died and only 1 patient in group B needed reoperation for sternal infection. The mean cardiopulmonary bypass (CPB) time and aortic cross-clamp time were 48.6 ± 12.6 min, 29.3 ± 8.5 min in the group A and 57.8 ± 14.1 min (p = 0.03), 34.3 ± 12.1 min ( p = 0.18) in the group B. There was no significant difference between the two groups in the ICU stay (17.8 ± 8.9 h in group A, 18.7 ± 9.5 h in group B, p = 0.79), mechanical ventilation support time (2.7 ± 1.7 h in group A, 3.6 ± 1.5 h in group B, p = 0.11), postoperative hospital stay (6.3 ± 1.5 days in group A, 7.4 ± 1.7 days in group B, p = 0.06), and chest tube drainage (6.4 ± 4.3 ml/kg in group A, 8.5 ± 3.8 ml/kg in group B, p = 0.16). No significant residual defects were found in both groups. The post-operation pressure gradient across the right ventricular outflow tract (RVOT) was significantly different between the two groups with 4.6 ± 1.8 mmHg in group A and 10.0 ± 6.8 mmHg in group B (p = 0.004) even if no significant difference was found between both groups before operation. No arrhythmia was found after operation. All the patients or the parents (100%) in the group A were satisfied with the cosmetic results, while the number in B group was 7 (43.8%) in questionnaire. The RAVI through tricuspid approach to repair doubly committed subarterial ventricular septal defect is a safe and feasible procedure with better hemodynamic performance of RVOT and less CPB time because of keeping pulmonary artery intact comparing to conventional approach. More importantly, the RAVI through tricuspid approach can be performed with favorable cosmetic results.