Colopexy of the equine large colon: comparison of two techniques.

The study investigates two different surgical techniques known as colopexy, which are used to prevent displacement or twisting of the large colon in horses. The study found that both techniques were effective at preventing these conditions for six months to a year after surgery, but two horses that underwent one of the techniques had severe weight loss.

Introduction

A colopexy is a veterinary surgical procedure carried out on horses to prevent large-colon displacement or volvulus, which is twisting of the colon. It involves suturing parts of the colon to the abdominal wall or other parts of the colon. This study aimed to compare the efficacy of two different colopexy techniques (named A and B in the study) in preventing postoperative recurrence of these conditions.

• Technique A: around 35 cm of the lateral free band of the ventral left colon was stitched to the abdominal wall, six cm left of the ventral midline.
• Technique B: the medial free band of the left ventral colon was stitched to the medial free band of the right ventral colon. Additionally, eight cm of the lateral free band of the left ventral colon was stitched to the abdominal wall, six cm left of the same midline.

Participants and Methods

The study involved eight clinically normal horses. One horse from each group was euthanized after six and twelve months. The position of the large colon, integrity of the sutures, and the presence of any other adhesions within the abdominal cavity were assessed. Attempts were also made to manually displace or twist the large colon. The horses that remained were anesthetized after either six or twelve months, after which the integrity of the sutures was re-evaluated.

Results

Apart from the initial weight loss common after surgery, all but two horses concluded the study with acceptable weight. However, two horses that had been operated on using Technique B experienced continuous weight loss severe enough to necessitate euthanasia.

Both methods were successful in preventing manual displacement and volvulus of the large colon centered at the sternal and diaphragmatic flexures. Additional protection from twisting of the colon at its base was noted with Technique A.

Conclusions

The study demonstrated that both colopexy techniques were overall effective in preventing large-colon displacement or twisting in horses for the duration of the follow-up period. However, concerns around weight loss in some of the horses treated with Technique B indicated that further research may be needed to refine or revise this particular approach.