Epicardial adipose tissue in patients with systemic sclerosis

Abstract Background Cardiac involvement is a major cause of death in patients with systemic sclerosis (SSc). Epicardial adipose tissue (EAT) has recently emerged as a mediator between systemic inflammatory disorders and cardiovascular disease, and may therefore play a role in the pathophysiology of cardiac involvement in SSc. Purpose To assess the correlation between EAT mass and left ventricular (LV) function, and to determine the prognostic value of EAT in patients with SSc. Methods Consecutive patients with SSc who underwent non-contrast thorax computed tomography and echocardiography were included. EAT mass was quantified using dedicated software (Figure A). The study endpoint was all-cause mortality. Results A total of 230 SSc patients [age 53±15 years, 14% male] were included. The median value of EAT mass was 67g (IQR: 45–101g). Patients with increased EAT mass (≥67g) showed specifically more impaired LV diastolic function as compared to patients with less EAT mass (<67g). After adjusting for age and comorbidities, EAT remained independently associated with LV diastolic function parameters including left atrial volume index (B=0.031, P=0.025), LV mass index (B=0.139, P=0.036), E/E$'$ (B=0.025, P<0.001) and E' (B=−0.012, P<0.001). During a median follow-up of 8 years 42 patients died, and by Kaplan-Meier analysis patients with increased EAT mass showed higher all-cause mortality rate as compared to patients with less EAT mass (log-rank p<0.001, Figure B). On multivariate analysis, EAT mass was independently associated with all-cause mortality (HR: 1.006; 95% CI: 1.001–1.010; p=0.010). Conclusion In patients with SSc, EAT mass is independently associated with LV diastolic dysfunction and higher mortality rate. Funding Acknowledgement Type of funding sources: None.