• Sarah Morton, Chris Eagle, Scott Wallman, Gaynor Wareham, Rob Major, Christopher Edmunds, and Sarah McLachlan.
• Essex and Herts Air Ambulance, Colchester, UK sarah.morton@doctors.org.uk.
• Emerg Med J. 2025 Feb 6.

BackgroundAppropriate dispatch of critical care teams to out-of-hospital cardiac arrest (OHCA) has been identified as a research priority emergency care in the UK. The study aimed to understand the criteria informing the decision to dispatch a critical care physician-paramedic prehospital team to OHCA in one UK region.MethodsAn invitation to participate in an anonymised online survey was sent by email to clinicians and non-clinicians working on the critical care (physician-paramedic) dispatch desk for the East of England Ambulance Service NHS Trust between June and July 2023. Demographic data relating to the experience of the dispatchers were collected alongside evaluating the effect of 15 predetermined criteria on OHCA dispatch (based on a pilot survey) on their decision to dispatch a physician-paramedic team. Responses to closed-end questions were calculated as percentages. A compulsory free text question on dispatching the physician-paramedic team was included. Free text data were interpreted by one author and the interpretation reviewed by all authors.Results20 respondents (19 critical care paramedics and one non-clinical dispatcher) participated, yielding a 79% response rate for clinical and 17% for non-clinical dispatchers. 'Witnessed cardiac arrest' and return of spontaneous circulation achieved on scene were criteria used by 100% of respondents in informing dispatch of a physician-paramedic team to OHCA. 10 of the 15 preidentified criteria were considered important in their decision-making by at least 75% of respondents. 'Age' was considered as more than just a number, instead incorporating both the nuances of a paediatric cardiac arrest and the importance of physiological reserve and frailty.ConclusionThe only 100% agreement in dispatch criteria was 'witnessed arrest'. Otherwise, variation existed and additional information, like identification of frailty, was gathered to support nuanced decision-making. Wider research across the UK would help identify factors and commonalities in OHCA physician-paramedic dispatch to target improved survival rates.© Author(s) (or their employer(s)) 2025. No commercial re-use. See rights and permissions. Published by BMJ Group.

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