Patients at Risk for Transfusion-A Six-Year Multicentre Analysis of More Than 320,000 Helicopter Emergency Medical Service Missions.

backgroundIn Europe, ambulances are increasingly being equipped with blood products for prehospital use. Available evidence on the early administration of blood products comes from military medicine and the Anglo-American medical literature; the evidence cannot be easily transferred to European countries.

objectivesThis study assesses the incidence of patients with massive haemorrhage after trauma and the potential need for prehospital blood transfusions.

methodsData reported by 37 German air rescue stations between 2015 and 2020 were retrospectively analysed to predict the need for massive transfusion.

resultsA total of 320,347 helicopter emergency medical service (HEMS) missions were performed and involved 2982 patients with potential need for massive transfusion after trauma (approximately 13 transfusions per helicopter per year). Men were most affected (73%). The median age of patients was 38 years. Traffic accidents accounted for 59% of the cases. Most patients sustained multiple injuries including traumatic brain injuries (62%), as well as thoracic (54%), abdominal (39%), and extremity injuries (41%). The median "rSIG" (reversed shock index multiplied with the Glasgow Coma Scale) decreased from 4.31 to 3.78.

conclusionsAlthough the incidence of haemorrhagic trauma patients is low, the prehospital administration of blood products might be useful as a potentially life-saving bridging treatment until hospital admission.