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Peritoneal mesothelial hypoxia during pneumoperitoneum is a cofactor in adhesion formation in a laparoscopic mouse
C R Molinas1, O Mynbaev, A Pauwels
1Center for Surgical Technologies, Katholieke Universiteit Leuven, Belgium. rogermolinas@hotmail.com
Objective:
To develop a laparoscopic mouse model to evaluate the hypothesis that mesothelial hypoxia during pneumoperitoneum is a cofactor in adhesion formation.
Design:
Prospective randomized trials.
Setting:
Academic research center.
Animal(S):
One hundred thirty female Naval Medical Research Institute (NMRI) mice.
Intervention(S):
Adhesions were induced by opposing monopolar lesions in uterine horns and pelvic side walls during laparoscopy and evaluated after 7 or 28 days under microscopic vision during laparotomy. The following pneumoperitoneum variables were assessed: duration (10 or 60 minutes), insufflation pressure (5 or 15 cm of water), insufflation gas (CO(2) or helium), and addition of oxygen (0-12%).
Main Outcome Measure(S):
Adhesions were scored quantitatively and qualitatively for extent, type, and tenacity.
Result(S):
Scoring of adhesions 7 or 28 days after laparoscopic surgery was comparable. Adhesions increased with duration of pneumoperitoneum and with insufflation pressure and decreased with the addition of oxygen. Half-maximal reduction of adhesions was obtained at 1.5% oxygen, whereas a maximal reduction required only 2%-3%. The effect of CO(2) and helium was similar.
Conclusion(S):
These data demonstrate the feasibility of the intubated laparoscopic mouse model and confirm previous observations in rabbits, indicating that mesothelial hypoxia plays a key role in adhesion formation.
Insights
This study developed a laparoscopic mouse model to investigate surgical adhesions. Results show that oxygenation during pneumoperitoneum significantly reduces adhesion formation, highlighting mesothelial hypoxia
Area of Science:
- Minimally invasive surgery
- Surgical pathology
- Animal models
Background:
- Postoperative adhesions are a common complication of abdominal surgery.
- Mesothelial hypoxia during pneumoperitoneum is hypothesized to contribute to adhesion formation.
- A reliable animal model is needed to study this phenomenon.
Purpose of the Study:
- To develop and validate an intubated laparoscopic mouse model.
- To test the hypothesis that mesothelial hypoxia during pneumoperitoneum is a cofactor in adhesion formation.
Main Methods:
- A prospective randomized trial was conducted using 130 female NMRI mice.
- Laparoscopic induction of adhesions involved monopolar lesions in uterine horns and pelvic side walls.
- Pneumoperitoneum variables (duration, pressure, gas, oxygenation) were systematically altered and adhesions scored.
Main Results:
- Adhesion formation increased with pneumoperitoneum duration and insufflation pressure.
- Addition of oxygen significantly reduced adhesion formation, with maximal reduction at 2%-3% oxygen.
- The insufflation gas (CO2 or helium) had similar effects on adhesion formation.
Conclusions:
- The intubated laparoscopic mouse model is feasible for studying adhesion formation.
- Mesothelial hypoxia plays a critical role in the development of postoperative adhesions.
- Oxygenation during pneumoperitoneum is a potential strategy to reduce adhesion formation.