Bacterial translocation after thermal injury

Area of Science:

• Gastroenterology
• Surgical Research
• Immunology

Background:

• Bacterial translocation is a significant complication following thermal injury.
• Mechanisms underlying post-burn bacterial translocation, including gastrointestinal blood flow changes and mucosal integrity, require further elucidation.

Purpose of the Study:

• To investigate the mechanisms of bacterial translocation after thermal injury.
• To explore the role of mesenteric vasoconstriction, its mediators, and potential therapeutic interventions.

Main Methods:

• Utilized rat, sheep, and minipig models to study bacterial translocation rates, mesenteric blood flow, and gut mucosal changes.
• Investigated the effects of nitroprusside, thromboxane A2 inhibition (OKY046), and bombesin on post-burn mesenteric vasoconstriction and translocation.

Main Results:

• Thermal injury significantly decreased mesenteric blood flow and increased bacterial translocation.
• Nitroprusside infusion prevented mesenteric vasoconstriction and reduced translocation; OKY046 inhibited thromboxane A2-mediated vasoconstriction.
• Bombesin treatment attenuated gut mucosal atrophy and prevented bacterial translocation.

Conclusions:

• Post-burn mesenteric vasoconstriction contributes to gut mucosal damage and bacterial translocation.
• Interventions targeting mesenteric vasoconstriction (e.g., nitroprusside) and mucosal integrity (e.g., bombesin) can mitigate bacterial translocation.