Combination of dexmedetomidine with buprenorphine enhances the antinociceptive effect to a thermal stimulus in the cat compared with either agent alone.
OBJECTIVE
To evaluate the sedative and antinociceptive effects of combinations of dexmedetomidine and buprenorphine in cats.


METHODS
Experimental randomized study.


METHODS
Twelve purpose-bred neutered domestic short-hair cats (4 male and 8 female) weighing 4.6 kg (range 3.7-5.5 kg) aged from 2 to 5 years.


METHODS
Six cats per group were administered buprenorphine (B) at 10 (B10) or 20 microg kg(-1) (B20) or dexmedetomidine (D) at 20 (D20) or 40 microg kg(-1) (D40) or a combination of B10/D20. A feline thermal nociceptive threshold testing device was used to evaluate the antinociceptive effects of the drugs before and up to 24 hours after drug treatment. Sedation was scored using a 100 mm visual analogue scale (VAS).


RESULTS
Thermal thresholds increased significantly after administration of all but D20. Area under the curve (AUC, hours degrees C) for the first 6 hours (mean +/- SD) for B20 (281 +/- 17.8) was significantly greater than B10 (260 +/- 11.4), D20 (250 +/- 7.9) and D40 (255 +/- 11.4). The AUC for B10/D20 (273 +/- 12.2) was significantly greater than D20 but not the other treatments. No sedation was seen after administration of B10 or B20 and maximal sedation was seen for all animals in the D40 and B10/D20 groups and most animals in the D20 group.


CONCLUSIONS
D20 alone had the smallest analgesic effect; B10 alone provided no sedation but their combination gave good sedation with analgesia comparable with B20.


CONCLUSIONS
This combination could be a useful multimodal sedative/analgesic regimen in cats.
Division of Companion Animals, School of Clinical Veterinary Science, University of Bristol, Langford, Bristol BS40 5DU, UK. louisa.slingsby@bristol.ac.uk
Louisa S
LS
Slingsby
Joanna C
JC
Murrell
Polly M
PM
Taylor
D000700:Analgesics / Q000008:administration & dosage; D018712:Analgesics, Non-Narcotic / Q000008:administration & dosage*; D000818:Animals; D002047:Buprenorphine / Q000008:administration & dosage*; D002415:Cats; D020927:Dexmedetomidine / Q000008:administration & dosage*; D004359:Drug Therapy, Combination; D005260:Female; D006358:Hot Temperature; D008297:Male; D017288:Pain Threshold / Q000187:drug effects
D000700:Analgesics; D018712:Analgesics, Non-Narcotic; D002047:Buprenorphine; D020927:Dexmedetomidine