PANDORA-register: supra- versus intra-annulaire kleppen bij TAVR-in-TAVR

BACKGROUND: As transcatheter aortic valve replacement (TAVR) expands to younger, lower-risk populations, the need for repeat procedures due to valve degeneration is expected to increase. TAVR-in-TAVR has emerged as a feasible strategy, although outcomes across supra-annular (SAV) and intra-annular (IAV) valve combinations remain unclear. The PANDORA (Supra-Annular Versus Intra-Annular Devices for TAVR-in-TAVR) international registry study assessed safety, hemodynamic performance, and clinical outcomes of TAVR-in-TAVR according to prosthetic configurations. METHODS: From an international multicenter registry (2011-2024), 172 TAVR-in-TAVR cases were identified among ≈30 000 TAVR procedures, with a median interval of 1401 days. Patients were stratified into 4 groups: SAV-IAV (n=32), SAV-SAV (n=29), IAV-SAV (n=74), and IAV-IAV (n=37). RESULTS: CoreValve/Evolut (49.4%) and Edwards SAPIEN (35.5%) were the most frequent index prostheses, whereas the second valve was mainly Edwards SAPIEN (60.5%), followed by Evolut (35.5%) and Myval/Octacor (4.0%). Structural valve deterioration was the leading failure mechanism (77.9%), while nonstructural valve deterioration dysfunction, alone or combined with structural valve deterioration, occurred in 40.7%. Overall Valve Academic Research Consortium 3 technical success was 91.3%, numerically highest in SAV-IAV and IAV-SAV (P=0.090). Thirty-day device success was 68%, also higher in SAV-IAV (75.9%, P=0.301), mainly influenced by elevated residual gradients (≥20 mm Hg in 12.7%) and the 30-day mortality rate (7.3%). At 1 year, the IAV-IAV group showed the numerically lowest freedom from death and heart failure hospitalization (76.1%, P=0.734). Male sex and chronic kidney disease independently predicted death at follow-up. CONCLUSIONS: TAVR-in-TAVR is feasible with generally favorable outcomes, although clinical and procedural profiles vary by the different prosthesis combinations. These findings highlight the need for further studies to refine device selection strategies.