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Archivos de medicina veterinaria

versão impressa ISSN 0301-732X

Resumo

CORDEIRO, MF et al. Evaluation of cardiorespiratory effects of an adjunct butorphanol in total intravenous anaesthesia protocol in goats under laparoscopy. Arch. med. vet. [online]. 2016, vol.48, n.2, pp.237-242. ISSN 0301-732X.  http://dx.doi.org/10.4067/S0301-732X2016000200015.

To evaluate the cardiorespiratory effects and postoperative analgesia of a total intravenous anesthesia protocol, twenty-four adult goats were assigned to four experimental groups: G1 and G2 underwent to laparoscopic procedure every 15 days, while G3, and G4 every 30 days. Xylazine (0.05 mg/kg IM) in all animals and butorphanol (0.5 mg/kg IM) in animals of G2 and G4 were used as premedication. Ketamine (2.0 mg/kg IV) anaesthetic induction was performed and subsequently the sheep were intubated and received oxygen (FiCO2 = 1.0). Animals were positioned in a Trendelenburg position and anaesthetic plane maintained by constant infusion of 2 mL/kg/h IV of a solution composed of: 12.5 g of guaiacolate, 25 mg of xylazine and 250 mg of ketamine in 250 mL of 5% dextrose. Haemo-gasometric (pH, PO2 PCO2, cHCO3) and clinical parameters (HR, RR, MAP and T), recovery time and postoperative analgesia were evaluated at different times of the anesthetic-surgical procedure. HR, RR, T, pH, PO2, PCO2 and cHCO3 varied through surgical time and PCO2 was significantly higher in butorphanol treated animals. The studied anaesthetic protocol resulted in a prolonged recovery, clinical hypotension and respiratory acidosis; butorphanol supplementation caused an increase in PaCO2 with no evident improvement of postoperative analgesia. Therefore, the practical application of this protocol indicates a special fluid, ventilation and recovery care. Further studies are needed on the analgesic effect of butorphanol in these situations to allow its indication.

Palavras-chave : butorphanol; xylazine; ketamine; hypotension.

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