677 Quick, Simple and just as Effective – Comparing PM:L3 Ratio to NELA, P-POSSUM and NSQIP Scores for Emergency Laparotomy

Abstract Aim Multiple tools (NELA, P-POSSUM, ACS-NSQIP) are available to assess mortality risks in patients requiring emergency laparotomy(1–3), but they time-consuming perform and have had limited uptake routine clinical practice many countries(4). Simpler measures, including psoas muscle:L3 vertebrae (PM:L3) ratio(5,6), may be useful alternates. This measure is quick perform, no special skills or equipment apart from basic CT viewing software. Method We performed an analysis on all the Hunter Emergency Laparotomy Audit (HELA) database, January 2016 December 2017. HELA a retrospective review of laparotomy undertaken discrete area NSW, Australia. Patients with abdomen were included (N = 500/562). A single slice axial image at L3 endplate level was analysed using ImageJ® software bilateral muscles. can done normal PACS practice. Results PM:L3 ratios this cohort mean 1.082 (95%CI 1.042-1.122; range 0.141-3.934). ratio significantly lower (p < 0.00001) those who did not survive beyond 30 days (mean 0.865 [95% CI 0.746-0.984 ]) 90 0.888 [95%CI 0.768-1.008]) compared that survived these periods (30 day 1.106 vs. 1.033-1.179], 1.112 1.070-1.154]) . These associations similar calculated by established risk assessment models. Conclusions reliable, easy tool identify high undergoing laparotomy.