Modelling long-term survival of horses following surgery for large intestinal disease.

This research investigates factors contributing to the long-term survival of horses that have undergone surgery for large intestinal diseases. Using diverse metrics such as heart rate, packed cell volume, age, and types of surgery, the study establishes a model to understand postoperative survival chances, which can improve prognoses and inform surgical decision-making.

Research Objectives and Methods

• The study aimed to identify the variables that might influence postoperative mortality of horses having surgery for large intestinal diseases. Additionally, the research aimed to develop a model to predict postoperative survival based on these identified variables.
• The research collected clinical data and long-term follow-up information from 275 horses that underwent surgery for large intestinal diseases.
• A Cox proportional hazards model, a statistical technique used for survival analysis, was developed to understand the relative risks of different variables on postoperative death.
• The fit of the developed model was then evaluated to assess its predictive power and suitability.

Research Findings

• The study revealed that age, heart rate, and packed cell volume (a test that measures the concentration of red blood cells in the blood) were continuous variables that were positively associated with the risk of postoperative death.
• Categorical variables, namely, having a surgical resection (removal of a portion of the large intestine) or a relaparotomy (a second operative procedure), were also positively associated with an increased risk of postoperative death.
• The odds ratio, or OR, indicates the odds of an event happening. For resection, the OR was 2.4 (within a confidence interval of 1.2 to 5.1), and for the relaparotomy, the OR was 3.5 (within a confidence interval of 1.4 to 8.4).

Conclusive Statements and Implications

• Based on the findings, the probability of postoperative survival following surgery for large intestinal disease in horses can be associated with the horse’s cardiovascular parameters (heart rate and packed cell volume) upon admission, the horse’s age, and whether the horse underwent a resection or a relaparotomy.
• The research suggests that prognosis for postoperative survival might be improved if horse surgeons perform the necessary surgical operation early, preferably before any cardiovascular compromise develops in the horse due to the large intestinal disease.
• It also suggests that horse surgeons should be aware that increasing age, resection of large colon, and relaparotomy are all associated with a worse prognosis for survival and require special care and attention.