Maintenance of prehospital anaesthesia in trauma patients: inconsistencies and variability in practice

Abstract

Background

Literature on prehospital anaesthesia predominantly focuses on preparation and induction, while there is limited guidance on anaesthesia maintenance. The hypothesis of this study was that for prehospital trauma patients, protocols and practice for anaesthesia maintenance may vary considerably between services. Hence, we sought to describe the practice of prehospital anaesthesia maintenance for trauma patients in Australia, New Zealand, and the UK.

Methods

An online practice survey of prehospital and retrieval services in Australia, New Zealand, and the UK was conducted from May to September 2022. Branching logic of between five and 140 questions covered services' background information, protocols relating to anaesthesia maintenance, and perceived effectiveness and governance.

Results

Forty-two services were approached with an 81% response rate. While most services (88%) had some form of maintenance protocol, only 14% had one specific for trauma patients. Most services (61%) used a combination of intermittent boluses and continuous infusions. Ketamine and midazolam were the favoured hypnotics, and fentanyl the favoured opioid. However, there was considerable variation in drug selection and dosing, and in the detail contained within protocols. There was high self-reported confidence in effectiveness and governance of anaesthesia maintenance practices.

Conclusions

Protocols for anaesthesia maintenance in prehospital trauma patients show considerable variation in content and detail across the surveyed services. Further consideration of pharmacokinetics and the specific aims of anaesthesia maintenance is warranted. More research is needed to establish the optimal choice of drugs, dosing, delivery, and adjustment criteria for anaesthesia maintenance in prehospital trauma patients.