Sedation with detomidine and acepromazine influences the endoscopic evaluation of laryngeal function in horses.
Authors: Lindegaard C, Husted L, Ullum H, Fjeldborg J
Journal: Equine veterinary journal
Summary
# Editorial Summary: Sedation Effects on Laryngeal Endoscopy Endoscopic examination of the equine larynx remains a cornerstone diagnostic procedure and purchase evaluation tool, yet concerns persist about whether sedative protocols may mask or artificially alter laryngeal function assessment. Lindegaard and colleagues investigated this clinically relevant question by comparing laryngeal responses during endoscopy under two sedation regimens—detomidine combined with acepromazine versus non-sedated controls—to determine whether the muscle-relaxing properties of these agents significantly influenced findings. The sedated horses demonstrated notably reduced laryngeal adduction and abduction responses compared to unsedated animals, with acepromazine and detomidine combination producing particularly pronounced suppression of dynamic laryngeal movement. These findings carry important implications for practitioners: results from sedated endoscopic examinations may underestimate or fail to detect subtle laryngeal dysfunction, potentially affecting diagnostic accuracy for conditions such as recurrent laryngeal neuropathy and influencing purchasing decisions. Clinicians should consider obtaining unsedated or lightly sedated endoscopic videos during dynamic airway evaluation when functional laryngeal assessment is diagnostically critical, whilst acknowledging that light sedation remains necessary for safety in many clinical situations.
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Practical Takeaways
- •When performing endoscopic examination of the larynx for diagnostic purposes, be aware that sedation with detomidine and acepromazine can alter findings and may not reflect the horse's resting laryngeal function
- •Consider performing unsedated endoscopy when possible, or interpret sedated findings cautiously, particularly for purchase examinations where accurate laryngeal assessment is critical
- •Document whether sedation was used during endoscopy as it significantly impacts the reliability and comparability of findings between examinations
Key Findings
- •Sedation with detomidine and acepromazine alters endoscopic findings during laryngeal examination in horses
- •The muscle-relaxing properties of commonly used sedatives can influence the appearance and assessment of laryngeal function during endoscopy
- •Results of upper airway endoscopy may be compromised when sedation is used due to drug-induced changes in laryngeal muscle tone