A review of equine anesthetic induction: Are all equine anesthetic inductions "crash" inductions?
Authors: Hubbell John A E, Muir William W, Gorenberg Emma, Hopster Klaus
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Equine Anaesthetic Induction The transition from standing consciousness to recumbency during anaesthetic induction represents a uniquely challenging physiological event in equine practice, yet considerable variation exists in how induction protocols are applied and interpreted. This literature review examines the behavioural and pharmacodynamic responses to induction agents in healthy adult horses, analysing drug interactions and mechanisms to clarify whether all inductions warrant the "crash" designation or whether current terminology obscures meaningful distinctions in induction quality. The authors synthesise evidence on induction agent actions to provide a framework for predicting and controlling the transition more reliably, moving beyond anecdotal descriptions toward evidence-based understanding of what determines a smooth versus problematic induction. For practitioners—whether administering agents, managing the fallen horse, or supporting recovery—this distinction matters considerably: recognising the pharmacological basis of different induction patterns allows refinement of drug selection, dosing, and sequencing to improve consistency and reduce risks such as poor positioning, trauma, or prolonged recovery. The review's emphasis on integrating behavioural observation with pharmacodynamic principles offers practical value for refining induction protocols tailored to individual patient factors rather than defaulting to standardised "crash" approaches regardless of circumstance.
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Practical Takeaways
- •Understanding the specific behavioral and physiologic responses during equine anesthetic induction can improve protocol consistency and reduce complications associated with the standing-to-recumbent transition
- •Knowledge of drug actions and interactions during induction helps equine anesthetists optimize induction protocols for safer outcomes
- •Not all equine inductions are 'crash' inductions—reviewing evidence may reveal alternative approaches to improve safety and predictability during this critical transition phase
Key Findings
- •Horses present unique anesthetic challenges compared to other companion animals due to the dramatic physiologic transition required during induction from standing to recumbent positions
- •The review focuses on behavioral and physiologic/pharmacodynamic responses to anesthetic induction drugs in healthy adult horses
- •Literature review aims to increase consistency and predictability of equine anesthetic induction protocols by examining drug actions and interactions