Evaluation of the effectiveness and costs of inhaled methoxyflurane versus usual analgesia for prehospital injury and trauma: Non-randomised clinical study

Murray D. Smith*, Elise Rowan, Robert Spaight, Aloysius N. Siriwardena

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)
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Abstract

Background
We aimed to investigate clinical benefits and economic costs of inhaled methoxyflurane when used by ambulance staff for prehospital emergency patients with trauma. Comparison is to usual analgesic practice (UAP) in the UK in which patient records were selected if treatment had been with Entonox® or intravenous morphine or intravenous paracetamol.

Methods
Over a 12-month evaluation period, verbal numerical pain scores (VNPS) were gathered from adults with moderate to severe trauma pain attended by ambulance staff trained in administering and supplied with methoxyflurane. Control VNPS were obtained from ambulance database records of UAP in similar patients for the same period. Statistical modelling enabled comparisons of methoxyflurane to UAP, where we employed an Ordered Probit panel regression model for pain, linked by observational rules to VNPS.

Results
Overall, 96 trained paramedics and technicians from the East Midlands Ambulance Service NHS Trust (EMAS) prepared 510 doses of methoxyflurane for administration to a total of 483 patients. Comparison data extracted from the EMAS database of UAP episodes involved: 753 patients using Entonox®, 802 patients using intravenous morphine, and 278 patients using intravenous paracetamol. Modelling results included demonstration of faster pain relief with inhaled methoxyflurane (all p-values 
Conclusion
When administered to adults with moderate or severe pain due to trauma inhaled methoxyflurane reduced pain more rapidly and to a greater extent than Entonox® and parenteral analgesics. Inclusion of inhaled methoxyflurane to the suite of prehospital analgesics provides a clinically useful addition, but one that is costlier per treated patient.
Original languageEnglish
Article number122
Number of pages14
JournalBMC Emergency Medicine
Volume22
Issue number1
Early online date07 Jul 2022
DOIs
Publication statusPublished - 01 Dec 2022
Externally publishedYes

Keywords

  • Ambulance
  • Analgesia
  • Emergency medical services
  • Methoxyflurane
  • Pain
  • Prehospital

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