Colonic Anastomotic Leak Model in Swine

Area of Science:

• Veterinary Surgery
• Gastrointestinal Surgery
• Surgical Complications Research

Background:

• Anastomotic leaks (ALs) are significant postoperative complications.
• Existing research models often use acute intraoperative dehiscence, not reflecting typical clinical AL onset.
• A clinically relevant swine model for colonic AL is presented.

Purpose of the Study:

• To establish a reproducible swine model for investigating postoperative colonic anastomotic leaks.
• To simulate the clinical timing and nature of anastomotic leaks.
• To provide a platform for future research into AL prevention and treatment.

Main Methods:

• Seventeen Yorkshire pigs underwent descending colon enterotomy and end-to-end handsewn anastomosis.
• A novel technique exteriorized sutures to a plastic tube, allowing controlled induction of anastomotic breakdown 3-4 hours postoperatively.
• Endpoints included behavioral, clinical, laboratory, and macroscopic assessments of leakage.

Main Results:

• Anastomotic leaks were successfully induced in 8 out of 11 experimental pigs (73%).
• Macroscopic evidence of fecal peritonitis and enteric spillage confirmed leaks.
• Statistically significant differences (p < 0.05) were observed between groups in fever, leukocytosis, and blood potassium levels.

Conclusions:

• The developed swine model effectively generated postoperative induced anastomotic leaks in a majority of animals.
• This model allows for controlled induction of leaks, simulating clinical scenarios.
• The model provides a valuable tool for studying the pathophysiology and management of anastomotic leaks.