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Defining the Systemic Response to Flight After Polytrauma in a Murine Model.

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Simulated flight after polytrauma in mice increased inflammation but did not worsen coagulopathy or endotheliopathy. Early altitude exposure potentiates the proinflammatory state following severe injury.

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Area of Science:

  • Aeromedical evacuation
  • Trauma research
  • Hypobaric physiology

Background:

  • Aeromedical evacuation is expanding, necessitating research into its effects on trauma patients.
  • The hypobaric and hypoxic environment of flight can negatively impact injury outcomes.
  • No studies have examined the effects of flight after polytrauma.

Purpose of the Study:

  • To investigate the effects of simulated flight on polytrauma in mice.
  • To determine if hypobaric hypoxia exacerbates inflammation, endotheliopathy, and coagulopathy post-polytrauma.

Main Methods:

  • Mice underwent a polytrauma model (laparotomy, crush injury, splenectomy, shock).
  • Polytrauma mice were exposed to simulated flight (1 hour at 12,000 feet).
  • Analyzed serum cytokines, endotheliopathy markers, lung histology, and coagulation profiles.

Main Results:

  • Flight combined with polytrauma elevated systemic proinflammatory cytokines (IL-1β, MCP-1, MIP-1α, TNFα).
  • Interleukin-1 alpha (IL-1α) was uniquely increased in polytrauma with flight.
  • Coagulopathy and endotheliopathy markers were not worsened by flight post-polytrauma.

Conclusions:

  • Early altitude exposure post-polytrauma has an additive effect on inflammation, potentially identifiable by IL-1α.
  • Flight did not exacerbate trauma-induced coagulopathy or endotheliopathy in this murine model.
  • Further research is needed to understand the physiological basis for worsened clinical outcomes after early post-injury aeromedical evacuation.