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INTRODUCTION: Prehospital care by physician-based helicopter emergency medical services (P-HEMS) may prolong total prehospital run time. This has raised an issue of debate about the benefits of these services in traumatic brain injury (TBI). We therefore investigated the effects of P-HEMS dispatch on prehospital run time and outcome in severe TBI. METHODS: Prehospital run times of 497 patients with severe TBI who were solely treated by a paramedic EMS (n=125) or an EMS/P-HEMS combination (n=372) were retrospectively analyzed. Other study parameters included the injury severity score (ISS), Glasgow Coma Scale (GCS), prehospital endotracheal intubation and predicted and observed outcome rates. RESULTS: Patients who received P-HEMS care were younger and had higher ISS values than solely EMS-treated patients (10%; P=0.04). The overall prehospital run time was 74+/-54min, with similar out-of-hospital times for EMS and P-HEMS treated patients. Prehospital endotracheal intubation was more frequently performed in the P-HEMS group (88%) than in the EMS group (35%; P