Deferral Versus Performance of Revascularization for Coronary Stenosis With Grey Zone Fractional Flow Reserve Values: A Systematic Review and Meta-Analysis

We searched PubMed, EMBASE, Cochrane Library, and Web of Science for studies using fractional flow reserve (FFR) to determine whether revascularization should be performed or deferred for patients with coronary stenosis and grey zone FFR. Meta-analysis was performed using the generic inverse variance method, and hazard ratios (HR) were synthesized with a random-effects model. Of 2766 records, 7 nonrandomized studies including 2683 patients were...