Colorectal anastomotic leakage: a new experimental model

Area of Science:

• Surgical Research
• Animal Models
• Gastrointestinal Surgery

Background:

• Anastomotic leakage is a major complication following colorectal surgery.
• Current animal models primarily focus on anastomotic healing, not leakage.
• A novel experimental model for colorectal anastomotic leakage is needed.

Purpose of the Study:

• To develop and validate a new experimental model for inducing colorectal anastomotic leakage in mice.
• To assess the feasibility of using a reduced number of sutures to create leakage.
• To identify reliable indicators of anastomotic leakage in this model.

Main Methods:

• Comparison of colorectal anastomosis techniques using 12, 6, and 5 interrupted sutures in C57Bl6 mice.
• Stepwise reduction in suture number to achieve a sufficient leakage rate.
• Determination of Anastomotic Bursting Pressure (ABP) after 7 days.
• Monitoring of weight loss and wellness scores as indicators of leakage.

Main Results:

• Anastomosis with 5 sutures resulted in leakage rates of 33.3% to 44.4% in repeated experiments.
• Significantly lower Anastomotic Bursting Pressure (ABP) in the leakage group (142.7 mmHg) compared to the control group (179.9 mmHg).
• Mice with leakage exhibited delayed weight loss and decreased wellness scores compared to non-leakage groups.

Conclusions:

• Creating colorectal anastomosis with 5 interrupted sutures provides a feasible model for studying anastomotic leakage.
• Weight loss patterns and wellness scores serve as valuable predictors of anastomotic leakage.
• This model can advance research into preventing and managing colorectal anastomotic leakage.