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OBJECTIVES Having an anomalous right subclavian artery has been quoted to be a risk factor for early and late adverse events. We wanted to determine the rate of adverse outcomes in patients who have undergone arch repair with an associated anomalous right subclavian artery. METHODS The follow-up of 76 patients, with an anomalous right subclavian artery, who underwent arch repair at a single institution for various indications between 1981 and 2017 was reviewed. RESULTS There were 12 patient deaths. Twenty-three patients required an aortic arch reintervention (17 surgeries, 2 of which were indicated for bronchial obstruction). At last follow-up, 8 of 54 surviving patients (15%) had arch reobstruction (peak gradient &amp;gt;25 mmHg or reintervention). Freedom from aortic arch obstruction at 10 and 15 years was 51% [95% confidence interval (CI) 36–65%] and 35% (95% CI 19–51%), respectively. Neither the complete resection of the adjacent ridge nor the detachment and reimplantation of the anomalous subclavian vessel seemed to have an impact on the rate of reobstruction [hazard ratio (HR) 1.6, 95% CI 0.77–3.5; P = 0.2 and HR 0.61, 95% CI 0.083–4.5; P = 0.6, respectively]. CONCLUSIONS Patients with an anomalous right subclavian artery are at risk of arch reobstruction necessitating reintervention but long-term follow-up was unable to demonstrate the mechanism of this obstruction in patients with this anomaly.

High prevalence of early arch reobstruction after arch repair in patients with anomalous right subclavian artery