Oxygenation, oxygen delivery and anaesthesia in the horse.
Authors: Hubbell J A E, Muir W W
Journal: Equine veterinary journal
Summary
# Editorial Summary: Oxygenation, Oxygen Delivery and Anaesthesia in the Horse Equine anaesthesia presents unique physiological challenges compared with other companion animals, and mortality rates remain concerning despite advances in protocols and monitoring. Whilst hypoxaemia and compromised oxygen delivery to tissues during general anaesthesia have long been suspected contributors to poor outcomes, establishing a definitive causal relationship has proved elusive. Hubbell and Muir systematically reviewed the existing literature examining oxygenation parameters, peripheral oxygen delivery mechanisms, and evidence-based interventions to optimise both during equine anaesthesia. Their analysis identified multiple strategies for improving arterial and tissue oxygen availability—including ventilatory modes, inspired oxygen concentrations, positioning, and haemodynamic support—though clinical effectiveness varies considerably depending on circumstances and technique. For practitioners managing anaesthetised horses, this review provides a framework for understanding which interventions offer genuine physiological benefit rather than relying on anecdotal or theoretical assumptions, enabling more targeted decision-making to reduce hypoxia-related complications and improve survival rates.
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Practical Takeaways
- •Equine anaesthetists should implement evidence-based strategies to optimize oxygenation and oxygen delivery, as horses are inherently high-risk surgical patients
- •Monitor for hypoxaemia and inadequate tissue oxygen delivery during anaesthesia, as these conditions may contribute to increased post-operative morbidity and mortality
- •Select oxygenation improvement methods based on their demonstrated efficacy and practical applicability to your clinical setting, as different techniques have varying success rates
Key Findings
- •Horses present unique anaesthetic challenges compared to other companion animals with increased mortality risk
- •Hypoxaemia and inadequate peripheral oxygen delivery during equine anaesthesia are potential mortality factors, though direct causal links remain unestablished
- •Multiple methods exist to improve oxygenation and oxygen delivery during equine anaesthesia with variable efficacy and clinical applicability