Risk factors associated with development of colitis in horses post-exploratory laparotomy.
Authors: Givan Stephanie A, Estell Krista E, Martinez-Lopez Javier, Brown James A, Wong David M, Werre Stephen R
Journal: Equine veterinary journal
Summary
# Postoperative Colitis After Exploratory Laparotomy: Risk Factors and Clinical Outcomes Postoperative colitis represents a significant complication in hospitalised horses undergoing exploratory laparotomy, yet its incidence and risk factors remain poorly characterised. Givan and colleagues conducted a retrospective case-control analysis of 504 equids admitted between 2011 and 2020, identifying 42 cases (8.3%) of postoperative colitis through logistic regression modelling of potential risk factors. Three independent variables emerged as statistically significant predictors: pelvic flexure enterotomy (odds ratio 3.7), postoperative leukopenia or leukocytosis (odds ratio 21.2), and plasma lactate concentrations between 2.0–4.0 mmol/L (odds ratio 3.0). Whilst colitis did not compromise survival to discharge—95% in the colitis group versus 93% in controls—affected horses required substantially longer hospitalisation (median 9 days versus 7 days), with important implications for case management costs and resource allocation. The findings warrant heightened clinical vigilance in horses undergoing pelvic flexure surgery, particularly those exhibiting abnormal white blood cell counts or moderate lactataemia postoperatively, though the authors acknowledge that specific infectious aetiologies could not be reliably determined due to inconsistent diagnostic protocols across the study period.
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Practical Takeaways
- •Monitor postoperative white blood cell counts closely after exploratory laparotomy; abnormal values (leukopenia or leukocytosis) are the strongest predictor of colitis development
- •Horses undergoing pelvic flexure enterotomy have significantly elevated colitis risk and should receive enhanced postoperative monitoring and prophylactic measures
- •While postoperative colitis requires longer hospitalization, it does not negatively impact survival to discharge, allowing for optimistic client communication regarding prognosis
Key Findings
- •Postoperative colitis occurred in 42 of 504 horses (8.3%) following exploratory laparotomy
- •Pelvic flexure enterotomy increased odds of colitis 3.7-fold (95% CI 1.7-7.9, p=0.001)
- •Postoperative leukopenia or leukocytosis increased odds of colitis 21.2-fold (95% CI 9.7-46.7, p<0.001)
- •Plasma lactate 2.0-4.0 mmol/L increased odds of colitis 3.0-fold (95% CI 1.3-6.7, p=0.008), with colitis patients hospitalized 2 days longer (median 9 vs 7 days) but similar survival rates (95% vs 93%)