Epicardial adipose tissue volumes for long-term risk stratification in patients with severe aortic stenosis undergoing transcatheter aortic valve replacement

Abstract Background Accurate risk stratification is important to improve patient selection and outcome of patients with severe aortic stenosis (AS) undergoing transcatheter aortic valve replacement (TAVR). As epicardial adipose tissue (EAT) is discussed to be involved in cardiovascular disease, it could be useful as a marker of poor prognosis in patients with severe AS undergoing TAVR. Purpose We hypothesized that EAT impacts long-term outcome of patients with severe AS undergoing TAVR independently from subtype and other risk factors. Methods A total of 416 patients diagnosed with severe AS by transthoracic echocardiography were assigned for TAVR and enrolled for systematic assessment. Patients underwent clinical surveys and 5-year long-term follow-up, with all-cause mortality as the primary endpoint. EAT volume was quantified on pre-TAVR planning CTs. Patients were retrospectively dichotomized at the median of 74cm3 of EAT into groups with low-EAT and high-EAT volumes. Mortality rates were compared using Kaplan-Meyer plots and uni- and multivariable cox regression analyses. Results A total number of 341 of 416 patients (median age 80.9years, 45% female) was included in the final analysis. Patients with high-EAT volumes had similar short-term outcome (p=0.794) but significantly worse long-term prognosis (p=0.023) compared to patients with low-EAT volumes. Increased EAT volumes were associated with worse long-term outcome (HR1.59;p=0.031) independently from concomitant cardiovascular risk factors, general type of AS and functional echocardiography parameters of AS severity (HR1.69;p=0.013). Conclusion Increased EAT volume is an independent predictor of all-cause mortality in patients with severe AS undergoing TAVR. It can be easily obtained from pre-TAVR planning CTs and may thus qualify as a novel marker to improve prognostication and management of patient with severe AS.Graphical Abstract