Eur J Emerg Med. 2018 Dec 7; Epub ahead of print

# Feasibility of prehospital freeze-dried plasma administration in a UK Helicopter Emergency Medical Service.

Oakeshott J, Griggs J, Wareham G, Lyon R; Kent Surrey Sussex Air Ambulance Trust.

BACKGROUND: Early transfusion of patients with major traumatic haemorrhage may improve survival. This study aims to establish the feasibility of freeze-dried plasma transfusion in a Helicopter Emergency Medical Service in the UK.

PATIENTS AND METHODS: A retrospective observational study of major trauma patients attended by Kent, Surrey and Sussex Helicopter Emergency Medical Service and transfused freeze-dried plasma since it was introduced in April 2014.

RESULTS: Of the 1873 patients attended over a 12-month period before its introduction, 79 patients received packed red blood cells (4.2%) with a total of 193 units transfused. Of 1881 patients after the introduction of freeze-dried plasma, 10 patients received packed red blood cells only and 66 received both packed red blood cells and freeze-dried plasma, with a total of 158 units of packed red blood cells transfused, representing an 18% reduction between the two 12-month periods. In the 20 months since its introduction, of 216 patients transfused with at least one unit of freeze-dried plasma, 116 (54.0%) patients received both freeze-dried plasma and packed red blood cells in a 1 : 1 ratio. Earlier transfusion was feasible, transferring the patient to the hospital before transfusion would have incurred a delay of 71 min (interquartile range: 59-90 min).

CONCLUSION: Prehospital freeze-dried plasma and packed red blood cell transfusion is feasible in a 1 : 1 ratio in patients with suspected traumatic haemorrhage. The use of freeze-dried plasma as a first-line fluid bolus reduced the number of prehospital packed red blood cell units required and reduced the time to transfusion.