EP.FRI.257 ELF 2: Defining the Denominator

Abstract Introduction The collaborative UK Emergency Laparotomy and Frailty (ELF) study was one of the first to investigate older adult population undergoing emergency surgery. Despite accounting for almost half laparotomies many considered high-risk, there remains a paucity research in this population. One undefined area is patient who presents with acute abdominal pathology treatable by laparotomy but do not undergo Aims primary aim estimate 90-day mortality patients presenting potentially surgery (NoLap). secondary aims are characterisation group, including frailty sarcopenia comparison those adults that have undergone (NELA ELLSA). In addition, decision-making process will be explored. Method Multicentre prospective cohort via established collaboratives (WelshBarbers, SSRG, OPSOC). ELF 2 requires at least 47 centres, recruiting 700 3months data collection REDCap NoLap same NELA inclusion/exclusion criteria. This compared matched from ELLSA. ELF2 includes demographics, co-morbidities, sarcopenia. Each followed up 1-year mortality. Heuristics behind decision analysed. Discussion trainee led project improve understanding being laparotomy. With ageing dominant health users future, defining denominator essential shared