Objective assessment of detomidine-induced analgesia and sedation in the horse.
Abstract: The effects of detomidine, a veterinary sedative analgesic, were studied in the horse. Novel objective techniques were employed to assess the analgesic and sedative potency of this compound. Intravenous doses of 0.010, 0.020 and 0.040 mg/kg were administered to eight adult Thoroughbred racehorses according to a double-blind crossover design. Analgesia was measured by determining the latency to onset of the skin twitch and hoof withdrawal reflexes following noxious thermal stimulation of the withers and fetlock, respectively. Sedation was assessed by quantifying spontaneous locomotor activity in horses confined to an activity chamber, and by electronic measurement of head ptosis. Linear, dose-related increases in the intensity and duration of analgesia were observed. However, dose-related increases in duration, rather than intensity of sedation were observed. In conclusion, detomidine is an effective analgesic in the horse, but it is more potent in producing sedation than analgesia.
Publication Date: 1988-06-22 PubMed ID: 3416917DOI: 10.1016/0014-2999(88)90685-1Google Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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This research paper studied the effects of the analgesic and sedative drug detomidine in horses. The scientists used new objective measurement techniques to determine how effective the drug is at relieving pain and inducing sedation.
Understanding Detomidine
- Detomidine is a type of veterinary medicine commonly classified as a sedative and analgesic. It’s often used in horses for minor surgeries and procedures, and for managing pain.
- The primary objective of this study was to understand and monitor the effectiveness and potency of detomidine, especially in the context of its mixed functions as a sedative and an analgesic.
Research Methodology
- The research was conducted on eight adult Thoroughbred racehorses. The researchers used a double-blind crossover design, a method in which each horse received every dosage of the drug at different points in time to eliminate potential bias and ensure fairness in the study.
- Detomidine was administered intravenously at three different dosages: 0.010, 0.020 and 0.040 mg/kg.
- To measure the drug’s analgesic (pain-relieving) capabilities, the researchers recorded the latency period or delay in the onset of skin twitch and hoof withdrawal reflexes when the horse’s withers and fetlock were subjected to noxious thermal stimulation.
- Sedation levels were assessed by watching and registering spontaneous locomotor activity when the horses were kept in an activity chamber. Electronic measurements of head drooping or ptosis were also recorded, which is a common indicator of sedation.
Study Findings
- The results showed linear and dose-related increases in both the intensity and duration of analgesia. This means the larger dosage of detomidine administered, the more effective the pain relief and for a longer period.
- Unlike analgesia, the intensity of the sedation did not show a dose-related increase. Instead, the duration of the sedation increased proportionately with the dosage of the drug.
- In conclusion, detomidine was found to be an effective analgesic but it showed higher potency in producing sedation than in providing pain relief.
Cite This Article
APA
Kamerling SG, Cravens WM, Bagwell CA.
(1988).
Objective assessment of detomidine-induced analgesia and sedation in the horse.
Eur J Pharmacol, 151(1), 1-8.
https://doi.org/10.1016/0014-2999(88)90685-1 Publication
Researcher Affiliations
- Department of Veterinary Physiology, Pharmacology and Toxicology, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803.
MeSH Terms
- Analgesics
- Animals
- Female
- Horses
- Hypnotics and Sedatives / pharmacology
- Imidazoles / pharmacology
- Male
- Motor Activity / drug effects
- Nociceptors / drug effects
- Sensory Thresholds / drug effects
- Time Factors
Citations
This article has been cited 3 times.- Adair HS, Levine D. Effects of 1-MHz Ultrasound on Epaxial Muscle Temperature in Horses. Front Vet Sci 2019;6:177.
- McAndrews A, Zarucco L, Hopster K, Stefanovski D, Foster D, Driessen B. Evaluation of Three Methods of Sensory Function Testing for the Assessment of Successful Maxillary Nerve Blockade in Horses. J Vet Dent 2025 Jan;42(1):48-54.
- Smith P, Tolbert MK, Gould E, Taylor A, Knych H, Messenger K. Pharmacokinetics, sedation and hemodynamic changes following the administration of oral transmucosal detomidine gel in cats. J Feline Med Surg 2020 Dec;22(12):1184-1190.
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