Abstract | REASONS FOR PERFORMING STUDY: In the UK butorphanol has a marketing authorisation for administration to horses for sedation in combination with detomidine, and at a higher dose (0.1 mg/kg bwt), for the alleviation of pain. There is only a limited number of clinical studies designed to examine the analgesic effects of butorphanol administration following surgery. OBJECTIVE: HYPOTHESIS: METHODS: A randomised, observer blinded clinical study in which 20 ponies received butorphanol and detomidine (Group B) or detomidine alone (Group C). Anaesthesia was induced with ketamine and diazepam and open castration performed. Pain was assessed by one individual using a dynamic interactive visual analogue scale (DIVAS) 100 mm in length (0 = no pain, 100 mm the maximum possible pain for that procedure). 'Rescue' analgesia was administered when DIVAS >50 mm and was butorphanol i.v. On the second occasion DIVAS was >50 mm, flunixin was administered i.v. Data from the DIVAS were analysed using a Mann Whitney Test. RESULTS: Only one animal did not require rescue analgesia after surgery (Group C). DIVAS were not significantly different between groups (P = 0.063). CONCLUSIONS AND POTENTIAL RELEVANCE:
Castration is sufficiently painful that administration of a single preoperative dose of butorphanol does not provide adequate post operative analgesia.
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Authors | E J Love, P M Taylor, C Clark, H R Whay, J Murrell |
Journal | Equine veterinary journal
(Equine Vet J)
Vol. 41
Issue 6
Pg. 552-6
(Jul 2009)
ISSN: 0425-1644 [Print] United States |
PMID | 19803050
(Publication Type: Journal Article, Randomized Controlled Trial)
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Chemical References |
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Topics |
- Analgesics
(therapeutic use)
- Animals
- Butorphanol
(therapeutic use)
- Horse Diseases
(drug therapy, etiology)
- Horses
- Male
- Orchiectomy
(adverse effects)
- Pain, Postoperative
(drug therapy, veterinary)
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