• Mark Dennis and RESET Study Group and Sydney ECMO Research Interest Group.
• Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia.
• Emerg Med Australas. 2022 Jun 1; 34 (3): 452-455.

ObjectiveTo describe on-scene times for out-of-hospital cardiac arrests (OHCA) transferred to hospital, the number of these that were extracorporeal cardiopulmonary resuscitation (ECPR) eligible and potential association between end-tidal carbon dioxide (ETCO2 ) and survival so as to inform planned interventional studies.MethodsProspective cohort study of all OHCA, of suspected medical cause, where resuscitation was commenced and who were transported to participating hospitals from October 2020 to May 2021.ResultsOne hundred and forty-nine OHCA were included. Forty-four (30%) patients survived to hospital discharge. Eighteen (8%) met ECPR inclusion criteria. Median on-scene time was 33 min (interquartile range [IQR] 24-44). Initial hospital ETCO2 for non-survivors was 35 mmHg (IQR 19-50), survivors 36 mmHg (IQR 33-45); P = 0.215. No patient with an ETCO2 less than 20 mmHg on hospital arrival to survived to hospital discharge.ConclusionsAverage on-scene time did not differ on survivorship. A small number of transferred patients with OHCA were ECPR eligible. ETCO2 less than 20 mmHg portends adverse prognosis. Our data will be used for future interventional studies.© 2022 The Authors. Emergency Medicine Australasia published by John Wiley & Sons Australia, Ltd on behalf of Australasian College for Emergency Medicine.

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