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Am J Vet Res. 2007 Mar;68(3):246-50.

Effects of buprenorphine on nociception and spontaneous locomotor activity in horses.

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1
School of Veterinary Medicine and Animal Science, University of São Paulo State, Botucatu, Brazil 18618-000.

Erratum in

  • Am J Vet Res. 2007 May;68(5):523.

Abstract

OBJECTIVE:

To investigate spontaneous locomotor activity (SLA) and antinociceptive effects of buprenorphine in horses.

ANIMALS:

6 healthy adult horses.

PROCEDURES:

Horses received each of 3 treatments (10 mL of saline [0.9% NaCl] solution, 5 microg of buprenorphine/kg, or 10 microg of buprenorphine/kg). Treatments were administered IV. Order of treatments was randomized, and there was a 10-day interval between subsequent treatments. Spontaneous locomotor activity was investigated in a behavioral box by use of infrared photoelectric sensors connected to a computer, which detected movement of each horse. Antinociceptive effect was investigated by hoof-withdrawal reflex latency (HWRL) and skin-twitching reflex latency (STRL) after painful stimulation with a heat lamp.

RESULTS:

Moderate excitement was observed in all horses from 5 to 10 minutes after the administration of both dosages of buprenorphine. The SLA increased significantly for 6 and 14 hours after IV administration of 5 and 10 microg of buprenorphine/kg, respectively. Values for HWRL increased significantly only at 30 minutes after injection of 5 microg of buprenorphine/kg, whereas STRL and HWRL each increased significantly from 1 to 6 hours (except at 2 and 4 hours) and 11 hours, respectively, after injection of 10 microg of buprenorphine/kg.

CONCLUSIONS AND CLINICAL RELEVANCE:

IV injection of buprenorphine caused a dose-dependent increase in SLA, but only the dose of 10 microg/kg induced analgesia on the basis of results for the experimental method used.

PMID:
17331012
DOI:
10.2460/ajvr.68.3.246
[Indexed for MEDLINE]
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