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Mechanical ventilation increases the inflammatory response induced by lung contusion.

Karlijn J P van Wessem1, Marije P Hennus, Linda van Wagenberg

  • 1Department of Trauma Surgery, University Medical Center Utrecht, Utrecht, The Netherlands. kwessem@umcutrecht.nl

The Journal of Surgical Research
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Blunt chest trauma combined with mechanical ventilation causes greater inflammation than ventilation alone. This highlights the need for lung-protective strategies in patients with pulmonary contusion.

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Area of Science:

  • Trauma and Injury
  • Pulmonary Medicine
  • Critical Care

Background:

  • Posttraumatic lung contusion is a frequent complication of blunt chest trauma, often necessitating mechanical ventilation.
  • Lung contusion and mechanical ventilation (MV) independently trigger inflammatory responses.
  • Polymorph neutrophil granulocytes (PMNs) are key indicators of inflammation in lung contusion.

Purpose of the Study:

  • To establish a rat model for investigating the inflammatory effects of high-volume ventilation following blunt chest trauma.
  • To compare the inflammatory response to mechanical ventilation alone versus mechanical ventilation after lung contusion.

Main Methods:

  • A reproducible blunt chest trauma model was created using a blast generator in Sprague-Dawley rats.
  • Rats were subjected to mechanical ventilation (MV) or blast-induced lung contusion followed by MV.
  • Systemic and pulmonary inflammation were assessed by measuring PMN counts and inflammatory cytokines (IL-6, IL 1β, KC, IL-10) in blood and bronchoalveolar lavage fluid (BALF).

Main Results:

  • Survival was inversely correlated with proximity to the blast generator.
  • Both MV and blast plus MV groups exhibited increased systemic and pulmonary inflammation compared to controls.
  • Rats with blast-induced lung contusion followed by MV showed a significantly higher inflammatory response than those receiving MV alone.

Conclusions:

  • The blast generator reliably induced blunt chest trauma in rats.
  • Mechanical ventilation exacerbates the inflammatory response when applied after lung contusion.
  • These findings underscore the critical importance of implementing lung-protective ventilation strategies in patients with pulmonary contusion to mitigate both local and systemic inflammation.