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Background  Hypothermia is common in trauma victims and is associated with increased mortality, however its causes are little known. The objective of this study was to identify the risk factors associated with hypothermia in prehospital management of trauma victims.    Methods  This was an ancillary analysis of data recorded in the HypoTraum study, a prospective multicenter study conducted by the emergency medical services (EMS) of 8 hospitals in France. Inclusion criteria were: trauma victim, age over 18 years, and victim receiving prehospital care from an EMS team and transported to hospital by the EMS team in a medically equipped mobile intensive care unit. The following data were recorded: victim demographics, circumstances of the trauma, environmental factors, patient presentation, clinical data and time from accident to EMS arrival. Independent risk factors for hypothermia were analyzed in a multivariate logistic regression model.    Results  A total of 461 trauma patients were included in the study. Road traffic accidents ( N  = 261; 57%) and falls ( N  = 65; 14%) were the main causes of trauma. Hypothermia (<35 °C) was present in 136/461 cases (29%). Independent factors significantly associated with the presence of hypothermia were: a low GCS (Odds Ratio (OR) = 0,87 ([0,81-0,92];  p  < 0.0001), a low air temperature ( OR  = 0,93 [0,91-0,96];  p  < 0.0001) and a wet patient ( OR  = 2,08 [1,08-4,00];  p  = 0.03).    Conclusion  The incidence of hypothermia was high on EMS arrival at the scene. Body temperature measurement and immediate thermal protection should be routine, and special attention should be given to patients who are wet.    Level of evidence  Prospective, multicenter, open, observational study; Level IV.

Hypothermia in trauma victims at first arrival of ambulance personnel: an observational study with assessment of risk factors