Laparoscopic insufflation with room air causes exaggerated interleukin-6 response

Area of Science:

• Surgical Physiology
• Immunology
• Gastroenterology

Background:

• The gut plays a crucial role in the body's response to surgical stress.
• Gut-mucosal cytokine measurements offer a precise reflection of operative stress.
• Laparoscopy results in a blunted cytokine response compared to laparotomy.

Purpose of the Study:

• To investigate if peritoneal cavity exposure to atmospheric air during laparotomy causes differential cytokine responses.
• To compare the effects of carbon dioxide (CO2) pneumoperitoneum versus room air pneumoperitoneum on interleukin-6 (IL-6) levels.

Main Methods:

• Eighty A/J mice were divided into four groups: CO2 pneumoperitoneum, room air pneumoperitoneum, anesthesia/port insertion only, and no intervention.
• Pneumoperitoneum was maintained at 3 mmHg for 60 minutes.
• Jejunal mucosa and serum IL-6 levels were measured 4 hours post-intervention and analyzed using ANOVA.

Main Results:

• Room air pneumoperitoneum significantly increased gut-mucosal IL-6 compared to all other groups.
• Room air also significantly elevated serum IL-6 levels compared to anesthesia/port insertion and control groups.
• CO2 pneumoperitoneum did not result in a significant IL-6 increase compared to control groups.

Conclusions:

• Peritoneal exposure to atmospheric air, not surgical trauma alone, amplifies IL-6 response post-intervention.
• CO2 laparoscopy's benefits may stem from excluding atmospheric air from the peritoneal cavity.
• This suggests CO2 pneumoperitoneum is advantageous in mitigating the inflammatory stress response.