1755 The differential determinants of delivering prehospital emergency anaesthesia within 45-minutes of the 999-call – a multi-centre, retrospective observational study Free Maria Kratz1, James Price2, Kate Lachowycz3, Rob Major3, Lyle Moncur4, Sarah McLachlan5, Chris Keeliher4, Alistair Steele6, Ed Barnard7 1Research, Audit, Innovation and Development (RAID), East Anglian Air Ambulance and Emergency Medical Services, Tampere University Hospital 2Research, Audit, Innovation and Development...