Survival after small intestine resection and anastomosis in horses.

The research article examines specific influences on survival rates in horses that underwent small intestine surgery between 1968 and 1986. The factors observed were variables like age, breed, reason for surgery, surgery type, and heart rate.

Objective and Methodology

• The researchers aimed to understand the survival rates in horses after undergoing a small intestinal resection and how different factors influence these outcomes.
• They used data from 140 horses that had undergone this type of surgery and studied the animals over a considerable period of time, from 1968 to 1986.
• The study analysis applied two primary statistical methods, Kaplan-Meier estimated survival curves, and the Cox proportional hazards regression model.
• Various factors such as age, breed, gender, reason for surgery, year of admission, length of bowel resected, method of anastomosis, and heart rates at admission and 24 hours post-surgery were taken into account.

Findings

• The study found a mortality rate of 65%, further classified into 51% that died during the postoperative period and 14% that died after being discharged from the hospital.
• The mean and 50% median survival times post-surgery were calculated as 1540 days and 27 days respectively.
• Horses that were 15 years or older, of Arabian breed, or were stallions, had a higher risk of hospital admission post-surgery.
• The most common reason requiring intestine surgery was observed to be strangulation of the bowel through a tear in the thin tissue connecting the intestines (mesenteric rent).
• It was also deduced that horses admitted post-1980 had a significantly longer survival than those admitted prior to this year.
• The type of surgical intervention also affected the survival rates. Survival was longer after anastomosis (joining of two small intestine sections) than after joining a small intestinal segment to the cecum (a part of the large intestine).
• However, the length of bowel resected and the method of anastomosis did not significantly influence survival.
• Of all the variables observed, heart rates at presentation and 24 hours post-surgery were found to be the most accurate predictors of survival.

Conclusion

• The research concluded that the survival of horses post a small intestine surgery is influenced by several factors, which include the horse’s age, breed, reason for surgery, type of surgery, year of operation, and heart rates during admission and post-surgery.
• This research contributes to veterinary medicine by aiding in better prediction and planning for the post-operative care and survival prediction of horses undergoing such surgeries.