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

Background: In 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.

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