Background: Patients with double-inlet left ventricle or tricuspid atresia with transposition of the great arteries are predisposed to systemic outflow tract obstruction necessitating systemic outflow relief operations (SORO).
Methods: Between January 2000 and February 2018, 30 patients with double-inlet left ventricle (n = 20) or tricuspid atresia (n = 10) with transposition of the great arteries underwent single-ventricle palliation. Arch obstruction was observed in 14 patients. Initial palliative procedures comprised pulmonary artery banding with (n = 4) or without (n = 14) arch repair, bilateral pulmonary artery banding with ductal stenting (n = 5), primary Norwood operation (n = 4), and palliative arterial switch operation (n = 1). Cox proportional hazards model was fitted in 15 patients with initial postnatal echocardiography to identify risk factors for decreased time to SORO.
Results: One early and one late death occurred during the median follow-up period of 66 months (10-year survival rate, 93.3%). Various types of SORO were required in 20 of 30 patients (66.7%): Damus-Kaye-Stansel procedure (n = 12), primary Norwood-type palliation (n = 4), palliative arterial switch operation (n = 1), and bulboventricular foramen extension (n = 3). Freedom from SORO at 5 years was 34.5% in all patients (N = 30). Cox regression for the subgroup (n = 15) revealed that arch obstruction (hazard ratio, 20.6; 95% confidence interval, 2.9 to 148.2; p = 0.003) and smaller systemic outflow tract area index at end-systolic phase (hazard ratio, 1.5 at 10 mm/m decrease; 95% confidence interval, 1.0 to 2.1; p = 0.033) were identified as risk factors for decreased time to SORO.
Conclusions: Arch obstruction and a smaller systemic outflow tract area index at end-systolic phase at initial presentation are predictors of subsequent need for SORO in patients with double-inlet left ventricle or tricuspid atresia with transposition of the great arteries.
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