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Thermal and mechanical nociceptive threshold testing in pregnant sheep
Gabrielle C Musk1, Fraser R Murdoch, Jonathan Tuke
1School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, Australia; Animal Care and Veterinary Services, University of Western Australia, Crawley, Western Australia, Australia.
Veterinary Anaesthesia and Analgesia
|November 22, 2013
Summary
Intra-peritoneal medetomidine increased thermal nociceptive thresholds in pregnant ewes post-surgery. This suggests medetomidine may be effective for post-operative pain management in sheep.
Area of Science:
- Veterinary Anesthesiology
- Pain Management in Animals
- Sheep Surgical Models
Background:
- Post-operative pain management is crucial in animal research.
- Evaluating novel analgesic strategies in pregnant animals requires careful consideration of safety and efficacy.
- Sheep models are utilized for preclinical studies due to physiological similarities with humans.
Purpose of the Study:
- To compare the efficacy of transdermal fentanyl versus intra-peritoneal medetomidine for post-operative analgesia in pregnant ewes.
- To assess the impact of these analgesic regimens on thermal and mechanical nociceptive thresholds following laparotomy.
Main Methods:
- A prospective, randomized experimental study was conducted on pregnant ewes (121 days gestation) undergoing laparotomy.
- Thermal and mechanical nociceptive thresholds were measured pre- and post-surgery.
- Ewes received either transdermal fentanyl (75 μg/hour) or intra-peritoneal medetomidine (3 μg/kg/hour) via osmotic pump post-surgery.
Main Results:
- Intra-peritoneal medetomidine significantly increased thermal nociceptive thresholds at 2 hours post-surgery (p=0.003).
- Transdermal fentanyl did not significantly alter thermal or mechanical nociceptive thresholds.
- No significant differences in mechanical nociceptive thresholds or skin temperature were observed between groups.
Conclusions:
- Intra-peritoneal medetomidine demonstrates potential as an analgesic agent in the immediate post-operative period for pregnant sheep.
- This finding suggests a possible role for medetomidine in managing post-operative pain in this specific animal model.
- Further research may explore optimal dosing and long-term effects.
