An increased potential for organ donors may be found among patients with out-of-hospital cardiac arrest.

"Declarations Ethics approval and consent to participateThis study was approved by the Legal Office of the Region of Southern Denmark (J. no. 21/13732). Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding No funding was received."

"In the Region of Southern Denmark, approximately 25% of all responses carried out with lights and sirens have a MECU dispatched along with the ambulance []. The prehospital anaesthesiologist in the MECU is responsible for the medical treatment. The level of treatment may include intubation and mechanical ventilation, inotropic support, medical treatment of elevated intracranial pressure, antibiotic therapy, and other supportive measures. The details of the findings, the diagnosis, and the prehospital treatment administered are all documented in the prehospital medical record by the anaesthesiologist. The entries into the prehospital medical record are transferred into a national database forming the basis of most of the Danish prehospital research []. Each patient is identified via the patient’s Civil Personal Registration Number. This number is a unique identification number assigned to all Danish citizens. By legislation, all citizens with a civil personal registration number are registered in the Danish Civil Registration System. Among others, this registry information about the citizen´s name, place of residence, sex, date of birth, place of birth, and citizenship []."