IMPORTANCEPrehospital treatment and release of patients may reduce unnecessary transports to the hospital and may improve patient satisfaction. However, the safety of patients should be paramount. OBJECTIVE To determine the extent of unplanned emergency department (ED) contacts, shortterm mortality, and diagnostic patterns in patients treated and released by a prehospital anesthesiologist supervising a mobile emergency care unit (MECU). DESIGN, SETTING, AND PARTICIPANTSThis retrospective cohort study used a manual review of prehospital and in-hospital medical records to investigate all living patients who were treated and

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