Comparison of Transcatheter Aortic Valve Implantation Outcomes Between Normal-Flow, Low-Gradient Severe Aortic Stenosis and Normal-Flow, High-Gradient Severe Aortic Stenosis.

Background: Normal flow low gradient severe aortic stenosis (NFLG-AS) with preserved ejection fraction is the most prevalent form of low gradient severe aortic stenosis. Despite the increased prevalence, the clinical outcomes and management strategy of NFLG-AS remain controversial. Therefore, our study aimed to evaluate transcatheter aortic valve implantation (TAVI) outcomes of patients with NFLG-AS compared with normal flow high gradient severe aortic stenosis (NFHG-AS).