TOTAL INTRAVENOUS ANESTHESIA (TIVA) FOR HERNIORRHAPHY IN CALVES

Abstract

The total intravenous anesthesia (TIVA) is an option for some surgeries in bovines for fields. The aim of this study was to evaluate blood gases effects, cardiorespiratory and glycemia on calves submitted the umbilical herniorraphy. We used eight calves aged from 9 ± 4 months, weighting 111 ± 43 kg. The animals were pre-treated with xylazine (0.05 mg/kg IV) and after 15 minutes was administered ketamine (2.0 mg/kg IV) followed by the continuous infusion of xylazine (0.05 mg/ml), guaifenesin (50 mg/mL) and ketamine (1mg/ml) at a rate of infusion of 2mL/kg/hour. The blood gases and glucose samples were collected immediately before the MPA (M_B) and the 5, 40 and 80 after the starting of TIVA (M₅, M₄₀ e M₈₀). The other variables were measured in M_B, 15 minutes after the MPA (Mx) and every 10 minutes after the starting of TIVA, entiring 80 minutes. The heart rate was higher in M_B than in the other stages (p <0.05) and respiratory rate increased in M₂₀ and M₅₀ compared to M_B and Mx (p <0.05). The PvCO₂ increased while PaO₂ decreased in M₄₀ and M₈₀, for M_B (p <0.05), P_VCO₂ in M₈₀ was lower than in M_B (p <0.05). The pHv was smaller in M₈₀ than M₅ and M_B (p <0.05), and HCO₃ was lower in M_B (p <0.05) compared to the others. The glucose was higher in M₄₀ and M₈₀ and M₅ for M_B (p <0.05). The recovery time was 152 ± 60 minutes after the end of the administration of the infusion of anesthetics. It was conclude that the anesthetic technique employed promoted respiratory depression, increased blood glucose and prolonged period of anesthetic recovery in calves.