Comparison of intraoperative behavioral and hormonal responses to noxious stimuli between mares sedated with caudal epidural detomidine hydrochloride or a continuous intravenous infusion of detomidine hydrochloride for standing laparoscopic ovariectomy.
Authors: Virgin Joanna, Hendrickson Dean, Wallis Ty, Rao Sangeeta
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Standing laparoscopic ovariectomy in mares presents a significant challenge for pain management, as effective analgesia must be maintained whilst preserving the animal's ability to stand and cooperate throughout the procedure. This study directly compared two detomidine-based sedation protocols—continuous intravenous infusion versus caudal epidural administration—by measuring both behavioural pain responses (using visual analogue scale scoring at eight surgical time points) and hormonal stress markers (serum cortisol levels) in twelve mares undergoing bilateral ovariectomy. Whilst the continuous IV infusion group demonstrated a significantly higher pain response during initial grasping of the first ovary, the two sedation methods produced comparable cortisol levels and behavioural responses across the remaining seven procedural manipulations, with surgeons reporting similar overall satisfaction with analgesia in both groups. These findings suggest that continuous IV detomidine infusion represents a viable alternative to epidural techniques for this procedure, potentially offering practical advantages through simplified administration without loss of analgesic efficacy. For practitioners, this validates a more straightforward sedation approach for standing ovariectomy, though careful monitoring during initial ovarian manipulation remains warranted to identify individual animals requiring supplementary analgesia.
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Practical Takeaways
- •Both continuous IV detomidine and caudal epidural detomidine are effective sedation protocols for standing ovariectomy, offering clinicians two viable options based on practice setup and expertise
- •If using continuous IV detomidine, be prepared for potentially greater pain response during initial ovarian manipulation and consider additional analgesia at this critical step
- •Cortisol monitoring is not necessary to differentiate efficacy between these two sedation methods during ovariectomy procedures
Key Findings
- •Serum cortisol levels were similar between IV detomidine infusion and caudal epidural detomidine groups at 3 of 4 measurement timepoints during standing laparoscopic ovariectomy
- •7 of 8 surgical manipulation timepoints showed no significant difference in pain (VAS) scores between the two sedation techniques
- •Initial grasping of the left ovary showed significantly higher median VAS scores in the continuous IV infusion group compared to caudal epidural group (P=0.05)
- •Continuous IV detomidine infusion provides equivalent analgesia and sedation to caudal epidural detomidine for standing laparoscopic ovariectomy in mares