Kim A, Sasaki N, Lee I, Seo JP. Comparison of intraoperative cardiorespiratory and behavioral responses to medetomidine combined with tramadol or butorphanol during standing laparoscopic ovariectomy in horses.
J Vet Med Sci 2021;
83:643-647. [PMID:
33583912 PMCID:
PMC8111346 DOI:
10.1292/jvms.20-0397]
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Abstract
The purpose of this study was to assess the cardiorespiratory and behavioral responses to
the combination of medetomidine and tramadol (M-T) or butorphanol (M-B) in standing
laparoscopic ovariectomy in horses. One ovary was removed under M-T and the contralateral
ovary was removed under M-B with at least 4 weeks between operations at random. Horses
were sedated using intravenous medetomidine (5 µg/kg) followed by tramadol (1 mg/kg) or
butorphanol (10 µg/kg) after 5 min. Sedation was maintained through the repeated injection
of medetomidine (1 µg/kg) and tramadol (0.4 mg/kg) or medetomidine (1 µg/kg) and
butorphanol (4 µg/kg) every 15 min. Cardiorespiratory function and behavioral responses,
including, sedation, ataxia, and analgesia, were assessed during the surgery. There were
no significant differences in cardiorespiratory values and sedation and analgesia scores
between M-T and M-B. Ataxia scores were significantly lower in M-T than in M-B. This
result suggests that M-T could maintain smooth and stable standing surgery with minimal
cardiorespiratory changes in horses.
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