Longevity of large aortic allograft conduits in Tetralogy with major aortopulmonary collaterals.

Abstract

Appropriate conduit selection for right ventricle (RV) to pulmonary artery (PA) connection has been extensively studied, with older implantation age, pulmonary (v. aortic) homografts, and true-sizing associated with increased longevity. Notably, patients with PA arborization abnormalities (ie MAPCAs) are reported to require earlier and more frequent conduit interventions. We aim to understand the behavior of large diameter aortic homografts in patients with MAPCAs, which are programmatically utilized at our institution.This is a single-center retrospective cohort study including all children < 12 years of age who underwent RV-PA connection using an aortic homograft = 16mm diameter between 2002-2019, with a primary outcome of freedom from any RV-PA reintervention and a secondary outcome of freedom from surgical reintervention. Patients were grouped by absolute and indexed conduit sizes for further analysis.A total of 336 conduits were followed for a median of 3.0 years; transcatheter (n = 30) and/or surgical (n = 35) reintervention was performed on 64 conduits. Estimated freedom from reintervention and surgical replacement was 84% and 90% at 5 years. Younger age and smaller absolute conduit size were associated with earlier reintervention, but conduit z-score (median 3.5) was not assocated with outcome.The programmatic use of oversized aortic homograft RV-PA conduits in the surgical repair of MAPCAs provides a focused experience that demonstrates similar longevity to reported best alternatives. Secondarily, conduit oversizing may improve durability and enables an increased likelihood of non-operative reintervention.

View details for DOI 10.1016/j.athoracsur.2021.01.054

View details for PubMedID 33600790