Prehospital blood transfusion in Brazil: results of the first year of implementation in an emergency medical service.

Introduction: Hemorrhagic shock is the main cause of death in the prehospital environment, which highlights the need to standardize measures aiming at bleeding control and volume replacement in this environment. In Brazil, the first prehospital packed red blood cell transfusion service started in September 2020, in Bragança Paulista, state of São Paulo.

Objectives: Describe the trends and characteristics of patients who received prehospital transfusions prior to hospital treatment during the first year of operation.