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Transcatheter Aortic Valve Replacement for Mixed Aortic Valve Disease: An Updated Meta-analysis
Background: Mixed aortic valve disease (MAVD) is defined as aortic stenosis (AS) occurring simultaneously with aortic regurgitation (AR), and is the most frequent concomitant valvular disease worldwide. Transcatheter aortic valve replacement (TAVR) is indicated based on guidelines for the primary lesion while considering the concomitant disease. TAVR seems to be associated with similar mortality rates in patients with MAVD compared to AS, while complications have conflicting data in literature. The aim of this study is to systematically synthesize the latest evidence to compare clinical outcomes of TAVR in MAVD compared to AS.
Methods: Systematic literature review was conducted on PubMed and Embase for studies on outcomes of TAVR in MAVD from inception until April 2024. Data extracted from the articles included baseline characteristics and several outcomes. Primary outcomes were short- (<30 days) and long-term (>30 days) mortality. Secondary outcomes were complications in accordance with the Valve Academic Research Consortium-2 (VARC-2) consensus, including paravalvular regurgitation, vascular and bleeding complications, pacemaker implantation, and cerebrovascular events. A random-effects model was used to pool risk ratios (RR) and 95% confidence intervals (CI) for clinical endpoints, and was conducted using RStudio.
Results: 11 observational studies including 133,558 patients were included in the analysis. There were no significant differences in primary endpoints (p>0.05). MAVD was associated with lower risk of cerebrovascular complications (RR: 0.65, 95% CI: 0.53-0.97) and higher risk of paravalvular regurgitation (RR: 1.29, 95% CI: 1.07-1.55). No significant differences were noted in other secondary outcomes (p>0.05).
Conclusions: The similar mortality risk of TAVR in MAVD compared to AS as well as higher risk of paravalvular regurgitation in MAVD is in accordance with most recent studies. However, this meta-analysis is the first to show a significantly lower risk of cerebrovascular events in MAVD patients. This study highlights the importance of future research to further delineate differences in procedural outcomes in this population.