Abstract 4140192: Time Trends in Outcomes of Trans-Catheter Aortic Valve Replacement with Balloon-expanding Versus Self-expanding Valves: A Meta-analysis of Randomized Controlled Trials

Background: The research on the outcomes of transcatheter aortic valve replacement with balloon-expandable valves (BEV) and self-expanding valves (SEV) are limited. Hypothesis: This study aims to compare the clinical and hemodynamic outcomes of BEV and SEV at short-term (30 days), mid-term (1 year), and long-term (>1 year) endpoints. Methods: PubMed, Embase, Scopus, and Cochrane Library databases were searched up to April 25, 2024, for randomized controlled trials (RCTs). Random-effect model (DerSimonian–Laird method) was used to pool the risk ratios (RR), mean differences (MD) and 95% confidence interval (CI) for binary and continuous outcomes, respectively. Results: A total of 11 RCTs comprising 4,325 patients (2,295 BEV, 2,030 SEV) were included. At short-term, the risk of cardiovascular (RR: 0.56, 95% CI: 0.36-0.87) and all-cause mortality (RR: 0.54, 95% CI: 0.35-0.81) were lower in the BEV group. However, no differences were noted between the two treatment modalities in longer follow-ups despite the lower risk of moderate to severe paravalvular leak (PVL) among BEV patients. The risk of stroke was comparable between two groups across all three follow-up endpoints, albeit a limited number of studies suggesting the BEV group showed a greater risk of clinical valve thrombosis in mid-term and long-term assessments. The need for permanent pacemaker implantation was lower in BEV arm in short-term (RR: 0.56, 95% CI: 0.37-0.87) and mid-term (RR: 0.78, 95% CI: 0.64-0.94). Yet, this difference was not observed in long-term follow-ups. Conversely, the SEV group had a larger effective orifice area with lower mean transvalvular pressure gradient from short-term (MD: 0.17, 95% CI: 0.07-0.26 and MD: 3.71, 95% CI: 2.64-4.78, respectively) to long-term (MD: 0.25, 95% CI: 0.17-0.32 and MD: 3.73, 95% CI: 3.19-4.27, respectively) periods. Conclusions: BEV is associated with reduced risk of clinical outcomes at short-term; however, most differences diminish in longer evaluations, except for moderate to severe PVL. Conversely, SEV is linked to better hemodynamic outcomes and a lower risk of clinical valve thrombosis across all follow-up durations.