Transcatheter versus surgical aortic valve replacement for severe aortic valve stenosis: Meta-analysis with trial...

Area of Science:

• Cardiovascular Medicine
• Interventional Cardiology
• Clinical Trials Methodology

Background:

• Conflicting evidence exists comparing transcatheter aortic valve implantation (TAVI) and surgical aortic valve replacement (SAVR), particularly in low-risk populations.
• Conventional meta-analyses may be susceptible to type I and II errors, leading to premature conclusions.

Purpose of the Study:

• To reevaluate the evidence comparing TAVI and SAVR using trial sequential analysis (TSA).
• To balance type I and II errors and determine the required information size for conclusive results.
• To compare TSA findings with conventional meta-analysis.

Main Methods:

• Systematic search for randomized controlled trials (RCTs) comparing TAVI and SAVR.
• Classification of RCTs into higher-risk and lower-risk patient groups.
• Performance of conventional meta-analysis and TSA, calculating required information size with 5% type I error and 90% power.

Main Results:

• Eight RCTs (n=8935) were analyzed. Higher-risk trials showed no significant mortality benefit for TAVI.
• Lower-risk trials suggested a mortality benefit with TAVI on conventional meta-analysis (P=.031), but TSA indicated potential spurious evidence (P=.116), requiring more data.
• TSA also suggested potential spurious evidence for the composite endpoint of death or disabling stroke in lower-risk patients (P=.053), necessitating further trials.

Conclusions:

• Conventional meta-analysis may have prematurely declared benefits for TAVI over SAVR.
• TSA highlights the need for caution in interpreting results from meta-analyses with limited sample sizes.
• Further research is required to definitively establish the benefits of TAVI, particularly in lower-risk patient groups.