ThP6.4 - Psoas Sarcopaenia as a Predictor of Mortality in Patients Over 65 with PR Bleeding: A Retrospective Case Controlled Study

Abstract Aims Sarcopaenia has been examined as a predictor for functional baseline and frailty in surgical patients and may predict mortality. The hypothesis of this study is that sarcopaenia is associated with increased risk of death after per rectal (PR) bleeding. Methods Patients over 65 who were admitted between January 2017 and December 2022, having had an episode of PR bleeding, that underwent cross sectional imaging were identified from the Southern health and social care trust database. Cross sectional imaging was accessed via PACS and total psoas area (TPA) calculated at the third lumbar vertebra by a radiology trainee and validated by a consultant radiologist. Clinical, mortality and demographic data was obtained from Northern Ireland Electronic Care Record (NIECR). Psoas muscle index (PMI) was then calculated by TPA and standardising for height in mm2/m2. Sarcopaenia was defined as PMI male < 545 mm2/m2 female < 385 mm2/m2. Results 77 Patients were included in this study. Patients were excluded based on the ability to standardise TPA for height. 27% (n 21) of patients were identified as sarcopaenic, 66% (n 14) of these patients have died. The median PMI showed differences between female mortality (490.44 mm2/m2) and non-mortality (559.49 mm2/m2) groups. Male patients also showed lower median PMI between mortality (599.79 mm2/m2) and non-mortality (643.05 mm2/m2 ) groups. Conclusions Sarcopaenia as a predictor for frailty is an important risk factor for all-cause mortality in PR bleeding. Cross-sectional imaging provides an opportunity to quantify risk as well as investigate aetiology for PR bleeding. Although radiation risk and cost effectiveness may limit use, it should be considered when imaging is available.