Post anaesthetic colic in horses: a preventable complication?
Authors: Senior J M, Pinchbeck G L, Allister R, Dugdale A H A, Clark L, Clutton R E, Coumbe K, Dyson S, Clegg P D
Journal: Equine veterinary journal
Summary
# Post-Anaesthetic Colic in Horses: Understanding the Risks Post-anaesthetic colic (PAC) represents a significant but poorly characterised complication following general anaesthesia for nonabdominal procedures, yet until this work there was minimal prospective data on its prevalence or causative factors. Senior and colleagues conducted a multicentre case-control study across four equine hospitals between April 2004 and June 2005, prospectively identifying all horses developing signs of abdominal pain within 72 hours of anaesthesia that could not be attributed to other causes, and comparing these cases against randomly selected controls from the same population. The overall prevalence of PAC was 5.2%, though this varied substantially between centres—a finding suggesting hospital-specific management practices or protocols may influence risk—with impaction being the most commonly diagnosed cause; multivariable analysis identified both the type of surgery performed and the individual hospital as significant risk factors, whilst preoperative fasting duration and opioid administration emerged as confounding variables. For equine professionals involved in perioperative care, these results indicate that certain surgical procedures carry genuinely elevated colic risk and warrant targeted prophylactic strategies, closer postoperative monitoring of gastrointestinal function, or modified anaesthetic protocols; importantly, the substantial variation between centres suggests that preventative measures are achievable, though further investigation is needed to identify which specific perioperative factors and practices account for these differences.
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Practical Takeaways
- •Monitor gastrointestinal function closely in horses for 72 hours post-anaesthesia for non-abdominal procedures, as 1 in 20 may develop colic
- •Risk of post-anaesthetic colic appears to vary by procedure type and hospital protocols—identify high-risk surgeries at your facility and implement targeted preventive measures
- •Work with your surgical team to standardize peri-operative management practices, as centre-level variations suggest modifiable risk factors exist
Key Findings
- •Post anaesthetic colic prevalence was 5.2% (95% CI 2.8-8.0) in horses undergoing non-abdominal anaesthesia
- •Prevalence of PAC varied significantly between the 4 hospitals studied, suggesting centre-specific risk factors
- •Type of surgery performed was independently associated with increased risk of PAC
- •Impaction was the most commonly diagnosed cause of post anaesthetic colic