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Background: Surgical aortic valve replacement and transcatheter aortic valve replacement (TAVR) are now both used to treat aortic stenosis in patients in whom life expectancy may exceed valve durability. The choice of initial bioprosthesis should therefore consider the relative safety and efficacy of potential subsequent interventions., Objectives: The aim of this study was to compare TAVR in failed transcatheter aortic valves (TAVs) versus surgical aortic valves (SAVs)., Methods: Data were collected on 434 TAV-in-TAV and 624 TAV-in-SAV consecutive procedures performed at centers participating in the Redo-TAVR international registry. Propensity score matching was applied, and 330 matched (165:165) patients were analyzed. Principal endpoints were procedural success, procedural safety, and mortality at 30 days and 1 year., Results: For TAV-in-TAV versus TAV-in-SAV, procedural success was observed in 120 (72.7%) versus 103 (62.4%) patients (p = 0.045), driven by a numerically lower frequency of residual high valve gradient (p = 0.095), ectopic valve deployment (p = 0.081), coronary obstruction (p = 0.091), and conversion to open heart surgery (p = 0.082). Procedural safety was achieved in 116 (70.3%) versus 119 (72.1%) patients (p = 0.715). Mortality at 30 days was 5 (3%) after TAV-in-TAV and 7 (4.4%) after TAV-in-SAV (p = 0.570). At 1 year, mortality was 12 (11.9%) and 10 (10.2%), respectively (p = 0.633). Aortic valve area was larger (1.55 ± 0.5 cm 2 vs. 1.37 ± 0.5 cm 2 ; p = 0.040), and the mean residual gradient was lower (12.6 ± 5.2 mm Hg vs. 14.9 ± 5.2 mm Hg; p = 0.011) after TAV-in-TAV. The rate of moderate or greater residual aortic regurgitation was similar, but mild aortic regurgitation was more frequent after TAV-in-TAV (p = 0.003)., Conclusions: In propensity score-matched cohorts of TAV-in-TAV versus TAV-in-SAV patients, TAV-in-TAV was associated with higher procedural success and similar procedural safety or mortality., Competing Interests: Author Disclosures Dr. Webb is a consultant to and has received research funding from Edwards Lifesciences, Abbott Vascular, Boston Scientific, and ViVitro Labs. Dr. Kim has received proctor or speaker fees from Boston Scientific, Abbott, Edwards Lifesciences, and Medtronic. Dr. Barbanti is a consultant for Edwards; and is an Advisory Board member for Biotronik. Dr. Sondergaard has received consultant fees and institutional research grants from Abbott, Boston Scientific, Edwards Lifesciences, Medtronic, and Symetis. Dr. Redwood is a proctor for and has received lecture fees from Edwards. Dr. Hamm is an Advisory Board member for Medtronic. Dr. Sinning has received speaker honoraria and research grants from Medtronic, Boston Scientific, and Edwards Lifesciences. Dr. Wood is a consultant to and has received research funding from Edwards Lifesciences, Abbott Vascular, and Boston Scientific. Dr. Sathananthan is a consultant to Edwards Lifesciences. Dr. Schofer has received speaker fees and travel compensation from Boston Scientific; and has received travel compensation from Edwards Lifesciences and Abbott/St. Jude Medical. Dr. Leipsic is a consultant to Circle CVI and Edwards Lifesciences; and provides institutional core laboratory services to Edwards Lifesciences, Abbott, Medtronic, and Neovasc. Dr. Andreas is a proctor for Edwards and Abbott; and is an Advisory Board member for Medtronic. Dr. Guerrero has received research grant support from Abbott Vascular and Edwards Lifesciences. Dr. Castriota is a proctor for Medtronic and Boston Scientific. Dr. Kodali has received research grants from Edwards Lifesciences, Medtronic, and Boston Scientific; has received grants and personal fees from Abbott Vascular and JenaValve; has received personal fees from Meril Lifesciences; has received personal fees from and holds equity in Admedus; and holds equity in Supira, Microinterventional Devices, Dura Biotech, and Thubrikar Aortic Valve. Dr. Conradi is a consultant to Edwards Lifesciences, Medtronic, Boston Scientific, Abbott, Neovasc, and JenaValve. Dr. Nazif has received consulting fees or honoraria from Edwards Lifesciences, Medtronic, Boston Scientific, Biotrace, and Baylis Medical; and has received consulting fees from and holds equity in Venus Medtech. Dr. Pilgrim has received research grants from Boston Scientific, Edwards Lifesciences, and Biotronik; and has received speaker fees from Boston Scientific and Biotronik. Dr. Babaliaros is a consultant to Edwards Lifesciences; and holds equity in Transmural Systems. Dr. Van Mieghem has received institutional research grants and consulting fees from Abbott, Boston Scientific, Medtronic, Daiichi-Sankyo, and PulseCath; and has received institutional research grant support from Edwards Lifesciences. Dr. Latib has received institutional research or grant support from Abbott, Boston Scientific, Medtronic, and Edwards Lifesciences; and has received personal consulting honoraria from Abbott, Edwards Lifesciences, and Medtronic. Dr. Hildick-Smith is a proctor and adviser to Boston Scientific, Medtronic, and Edwards Lifesciences. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose., (Copyright © 2021 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.)

Background: Transcatheter heart valve (THV) dysfunction with an elevated gradient or paravalvular leak (PVL) may be documented late after THV implantation. Medical management, paravalvular plugs, redo THV replacement, or surgical valve replacement may be considered. However, late balloon dilatation is rarely utilized because of concerns about safety or lack of efficacy.Objectives: We aimed to evaluate the safety and efficacy of late dilatation in the management of THV dysfunction.Methods: All patients who underwent late dilatation for symptomatic THV dysfunction at 2 institutions between 2016 and 2021 were identified. Baseline, procedural characteristics, and clinical and echocardiographic outcomes were documented. THV frame expansion was assessed by multislice computed tomography before and after late dilatation.Results: Late dilatation was performed in 30 patients a median of 4.6 months (IQR: 2.3-11.0 months) after THV implantation in the aortic (n = 25; 83.3%), mitral (n = 2; 6.7%), tricuspid (n = 2; 6.7%) and pulmonary (n = 1; 3.3%) position. THV underexpansion was documented at baseline, and frame expansion substantially improved after late dilatation. The mean transvalvular gradient fell in all patients. For aortic THVs specifically, mean transaortic gradient fell from 25.4 ± 13.9 mm Hg to 10.8 ± 4.1 mm Hg; P < 0.001. PVL was reduced to ≤mild in all 11 patients with a previous >mild PVL. Embolic events, stroke, annular injury, and bioprosthetic leaflet injury were not observed. Symptomatic benefit was durable at 19.6 months (IQR: 14.8-36.1 months) follow-up.Conclusions: Balloon dilatation late after THV implantation appears feasible and safe in appropriately selected patients and may result in THV frame expansion resulting in improvements in hemodynamic performance and PVL. [ABSTRACT FROM AUTHOR]