CT-derived body composition: Differential association with disease, age and inflammation in a retrospective cohort study.

Abstract

BackgroundLow skeletal muscle mass and density, as assessed by CT-body composition (CT-BC), are recognised to have prognostic value in non-cancer and cancer patients. The aim of the present study was to compare CT-BC parameters between non-cancer (abdominal aortic aneurysm, AAA) and cancer (colorectal cancer, CRC) patients.MethodsTwo retrospective multicentre cohorts were compared. Thresholds of visceral fat area (VFA, Doyle), skeletal fat index (SFI, Ebadi), skeletal muscle index (SMI, Martin), and skeletal muscle density (SMD, Martin) were applied to these cohorts and compared. The systemic inflammatory response (SIR) was measured by the systemic inflammatory grade (SIG).Results1695 patients were included; 759 patients with AAA and 936 patients with CRC. Low SMD (33% vs. 66%, p 2 (OR 1.37, 95% CI 1.08-1.73, p = 0.01), and elevated SIG (OR 1.19, 95% CI 1.03-1.37, p = 0.02) were independently associated with increased odds of low SMD.ConclusionsIncreasing age and systemic inflammation appear to be important determinants of loss of skeletal muscle mass and quality irrespective of disease.