Modelling long-term survival of horses following surgery for large intestinal disease.
Authors: Proudman C J, Edwards G B, Barnes J, French N P
Journal: Equine veterinary journal
Summary
# Editorial Summary Large intestinal surgical colic carries significant long-term mortality risk, yet practitioners have had limited evidence to guide prognostic conversations with owners. Proudman and colleagues analysed clinical records and follow-up data from 275 horses that underwent surgery for large intestinal disease, developing a Cox proportional hazards model to identify factors predicting post-operative death. Several pre-operative variables emerged as strong mortality indicators: elevated heart rate and packed cell volume (PCV) both increased risk substantially, whilst older horses fared worse than younger animals; horses requiring resection faced 2.4 times greater mortality risk, whilst those needing relaparotomy had 3.5 times higher odds of post-operative death. These findings underpin a practical message—early surgical intervention before cardiovascular decompensation develops offers the best chance of long-term survival, and farriers and associated practitioners should recognise that cases presenting with tachycardia or polycythaemia warrant urgent veterinary attention. For surgeons, this model provides an evidence-based framework for prognostication and reinforces that whilst large intestinal resection is sometimes necessary, the added complexity of repeat laparotomy substantially worsens outcomes.
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Practical Takeaways
- •Refer horses with large intestinal disease for surgery urgently before cardiovascular parameters deteriorate, as heart rate and PCV on admission are strong prognostic indicators
- •Be aware that older horses, those requiring large colon resection, and those needing repeat surgery have significantly worse survival outcomes—discuss these risks with owners preoperatively
- •Monitor admission vital signs closely; elevated heart rate and PCV indicate greater post-operative mortality risk and should prompt expedited surgical intervention
Key Findings
- •Age, heart rate, and packed cell volume (PCV) were positively associated with post-operative mortality risk
- •Resection of large colon increased mortality risk with OR 2.4 (95% CI 1.2-5.1)
- •Relaparotomy increased mortality risk with OR 3.5 (95% CI 1.4-8.4)
- •Early surgery prior to cardiovascular compromise improves post-operative survival probability