Retrospective evaluation of the impact of atropine administration on incidence of post-operative colic in healthy, isoflurane-anaesthetised horses.
Authors: Varner Kelley M, Curtiss Alexandra L, Hogan Patricia M, Love Kim, Dodam John R
Journal: Equine veterinary journal
Summary
# Editorial Summary During isoflurane anaesthesia, horses commonly develop bradycardia driven by elevated vagal tone, which can compromise cardiac output and systemic blood pressure—a haemodynamic concern that traditionally limits anticholinergic use in equine practice due to fears of post-operative ileus and colic. This retrospective analysis examined whether atropine administration during general anaesthesia in healthy horses actually increased the incidence of post-operative abdominal discomfort, a key clinical question given the drug's cardiovascular benefits versus its putative gastrointestinal risks. The findings should provide evidence-based guidance on whether atropine can be safely deployed intra-operatively without substantially elevating colic risk in the immediate post-operative period. For anaesthetists, surgeons and equine clinicians, clarifying the true relationship between intra-operative atropine and post-operative colic outcomes has direct implications for haemodynamic management protocols and patient safety during elective procedures. The practical take-home will likely inform decision-making around balancing cardiovascular stability during surgery against gastrointestinal morbidity in recovery.
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Practical Takeaways
- •This retrospective analysis helps clarify the actual risk-benefit profile of atropine in anaesthetised horses, potentially informing safer perioperative protocols
- •Understanding post-operative colic incidence with atropine use may guide anticholinergic administration decisions in horses at risk of intraoperative bradycardia
- •Results may support more evidence-based use of atropine in equine anaesthesia rather than blanket avoidance due to theoretical ileus concerns
Key Findings
- •Study evaluated the prevalence of post-operative abdominal discomfort in healthy horses receiving atropine during isoflurane anaesthesia
- •Anticholinergic use in horses is limited due to concerns about ileus and abdominal discomfort
- •Atropine administration addresses bradycardia secondary to high vagal tone to maintain cardiac output and blood pressure