Long-term survival of equine surgical colic cases. Part 2: modelling postoperative survival.
Authors: Proudman C J, Smith J E, Edwards G B, French N P
Journal: Equine veterinary journal
Summary
# Editorial Summary Colic surgery carries substantial postoperative mortality risk, yet identifying which factors most influence long-term survival remains clinically valuable for prognostic counselling. Proudman and colleagues analysed 321 horse-years of postoperative survival data using Cox regression modelling to determine which variables predicted outcome following colic surgery. Four factors emerged as significant independent predictors of reduced survival: elevated packed cell volume (PCV), greater length of intestinal resection, prolonged surgical duration, and epiploic foramen entrapment, with each demonstrating approximately linear relationships to survival probability when adjusted for time-to-surgery interval. Notably, patient age and heart rate did not significantly influence long-term survival, and the analysis found minimal variation attributable to individual surgeons, anaesthetists or referring veterinarians, suggesting that case factors rather than personnel differences drove survival outcomes. These findings provide practitioners with evidence-based parameters for realistic prognostication and may help inform preoperative decision-making, particularly regarding the extent of resection required and the urgency of surgical intervention timing.
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Practical Takeaways
- •Earlier surgical intervention for colic cases (shorter time from onset to surgery) improves long-term survival outcomes, reinforcing the importance of prompt referral
- •Epiploic foramen entrapment carries a worse prognosis than other colic types; owners should be counselled accordingly about reduced long-term survival expectations
- •Elevated PCV and extensive intestinal resection are negative prognostic indicators; these factors should inform realistic discussions with owners about postoperative survival prospects
Key Findings
- •Increased packed cell volume (PCV), longer intestinal resection length, longer time to surgery, and longer duration of surgery were each associated with decreased postoperative survival in a linear relationship
- •Epiploic foramen entrapment was the only categorical diagnosis significantly associated with decreased postoperative survival
- •Patient age and heart rate showed no significant association with decreased postoperative survival
- •Residual variation in survival outcomes could not be significantly attributed to referring veterinary surgeon, anaesthetist, or surgeon, suggesting outcome variation is primarily related to case factors rather than personnel