FTP1.7 Critical decision analysis of pre-hospital major haemorrhage protocol activation

Abstract Aims Major haemorrhage protocol activation (MHPA) facilitates immediate blood product availability and institutional capacity readiness for bleeding trauma patients. MHPA is a difficult decision pre-hospital, where two thirds of MHPAs occur. We aimed to identify the determinants and influences of the pre-hospital MHPA decision. Methods This prospective qualitative study had Health Research Authority approval (REC 22/PR/0089). Physicians from one helicopter emergency medical service (HEMS) were purposively sampled. Written informed consent was obtained. Cases representing difficult MHPA decisions within the previous six months were included. Semi-structured interviews were conducted via Microsoft Teams, following the critical decision analysis method. Interviews were transcribed and analysed using a 6-step inductive thematic analysis method on NVivo. Results Twelve interviews were conducted with nine participants: median age 37 years (range 34-45), median post-graduate experience 12 years (IQR 10.5-14.8), and median HEMS experience 1 year (IQR 0.5-4.9). Cues for (and against) the MHPA decision included: hard evidence of bleeding (or bleeding judged to be non-severe); initial information fit their mental model of a bleeding patient (or did not); patient deterioration (or response to resuscitation); acknowledgement that injuries and bleeding can be missed (or uncertainty of clinical findings); and alternative diagnoses were considered less likely (or more likely). Other influences of the MHPA decision were heuristics (especially anchoring bias), situational awareness, previous experience, colleagues on-scene, time- and task-pressure, and the desire for diagnostic accuracy and professional reputation. Conclusions Multiple determinants and influences affect the pre-hospital MHPA decision. Acknowledging these cognitive processes will inform efforts to improve decision-making in trauma.