Visceral Fat Area Is a Better Predictor Than Coronary Artery Calcification Score for Cardiovascular Outcomes and All-Cause Death in Patients on Hemodialysis

Objectives: The aim of this study is to compare the prognostic effects of visceral fat area (VFA) with coronary artery calcification score (CACs) in patients on maintenance hemodialysis. Design and Methods: In the prospective study with no intervention, clinical characteristics and serum biochemical indexes at base-line for each patient were collected through the electronic medical records. Body composition assessment using bioelectrical impedance analysis, computed tomography examination with the Agatston scoring method, and echocardiographic measurements were performed at enrollment. Primary endpoints included cardiovascular events (CVEs), cardiovascular death (CVD), and all-cause death. Results: A total of 97 Chinese patients aged 48 (35-62) years were enrolled from our Hemodialysis Center, of which 61.9% were male and 20.6% had diabetes. The median of VFA and CACs at baseline was 64.5 (43.5-88.7) cm(2) and 0.9 (0-467.6), respectively. CVEs occurred in 20 (20.6%) patients during a median follow-up of 26.4 (13-27.7) months. The cardiovascular and all-cause mortality was 8.2% (8 patients) and 11.3% (11 patients), respectively. VFA was associated with CVEs (hazard ratio [HR] = 9.21 for VFA >= 71.3 cm(2) vs. VFA <71.3 cm(2), P = .017), CVD (HR = 1.11 for 1 cm(2) increase, P = .035), and all-cause mortality (HR = 1.08 for 1 cm(2) increase, P = .011). Also, VFA was significantly correlated with cardiac structure parameters and the development of left ventricular hypertrophy (odds ratio = 1.02 for 1 cm(2) increase, P = .03). Yet, CACs were not correlated with CVEs, CVD, or all-cause mortality. Conclusions: Increased VFA can be used as an independent predictor for CVEs, CVD, and all-cause mortality. The effect VFA exerts on cardiac reconstruction might be the underlying mechanism. Further studies are warranted for the management of VFA in the hemodialysis population. (C) 2020 The Authors. Published by Elsevier Inc. on behalf of the National Kidney Foundation, Inc.

Automated summary

The study aims to compare the prognostic effects of visceral fat area (VFA) with coronary artery calcification score (CACs) in patients on maintenance hemodialysis. The results showed that increased VFA can be used as an independent predictor for cardiovascular events, cardiovascular death, and all-cause mortality in this population, suggesting further studies are warranted for the management of VFA.