Profile and outcomes of emergency department presentations based on mode of arrival: A state-wide retrospective cohort study

Objective Understanding how people arrive to the ED assists in planning health services' response to fluctuating ED demand. The present study aimed to describe and compare demographics, clinical characteristics and health service outcomes of adult ED patient presentations based on mode of arrival: brought in by police (BIBP)/brought in by ambulance (BIBA)/privately arranged transport (PAT). Methods A retrospective cohort study of ED patient presentations made between 1 January 2018 and 31 December 2020 from all public hospital EDs across Queensland, Australia. Descriptive and inferential analyses were performed to ascertain presentation characteristics and predictors of health service outcomes. Results From 4 707 959 ED presentations, 0.9% were BIBP, 34.8% were BIBA and 64.0% were PAT. Presentations BIBP were younger and comprised a higher proportion of mental health problems and Emergency Examination Authority orders compared to presentations BIBA or PAT. Compared to presentations BIBP or PAT, presentations BIBA were more likely to be assigned more urgent triage scores, be admitted to hospital, and have a longer ED length of stay (LOS). Compared to other modes of arrival, presentations arriving by PAT were more likely to be discharged and have a shorter ED LOS. Conclusion Presentations BIBA and BIBP encountered a longer ED LOS and higher admission rates than PAT, suggesting more complex care needs than those from PAT. Clinical care pathways for specific modes of arrival that support pre-hospital providers and patients and are considerate of the throughput and output stages of ED care may be needed.