Parâmetros hemodinâmicos, ventilatórios e intracranianos, em suínos anestesiados com isofluorano ou propofol, mantidos sob ventilação espontânea e fio2 de 0,5
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Data
2016-07-27
Autores
Ido, Cléber Kazuo [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Com esse estudo procurou-se avaliar comparativamente a anestesia total intravenosa pelo propofol e a anestesia geral inalatória pelo isofluorano e determinar qual modalidade anestésica foi mais vantajosa à dinâmica cardiorrespiratória, bem como sobre parâmetros intracranianos, em suínos recebendo FiO2 de 0,5 sob ventilação espontânea. Para tanto foram utilizados 16 animais machos ou fêmeas, distribuídos aleatoriamente em dois grupos de igual número: GI (Isofluorano e FiO2=0,5) e GP (Propofol e FiO2=0,5). Para todos os suínos, empregou-se como medicação pré-anestésica azaperona (2 mg/kg). Em ambos os grupos, os animais foram induzidos com propofol pela via intravenosa, na dose necessária para intubação orotraqueal. No grupo GI, após a intubação orotraqueal dos animais, o vaporizador foi ajustado para 1,5 CAM. No grupo GP, a manutenção anestésica foi realiza com propofol na taxa de 0,5 mg/kg/min. Em ambos os grupos, os parâmetros hemodinâmicos, ventilatórios e intracranianos foram avaliados 40 minutos após a indução da anestesia (M0), seguida de novas mensurações em intervalos de 15 minutos (de M15 a M60). Os resultados das variáveis paramétricas foram analisados pelo software SAS 9.1 (2010). De todos os parâmetros avaliados, houve diferença entre grupos nas variáveis respiratórias (PvO2, Hbv, ETCO2, f, Vt e Tins), cardiovasculares (PAS e IRPT) e intracranianos (PIC, PPC e TIC). Com relação aos momentos dentro do mesmo grupo, houve diferença no GI para as variáveis respiratórias (PaCO2, pH, PvO2, ETCO2, Vm, PAO2 e P(A-a)O2) e intracranianas (TIC). Já no GP, diferiram significativamente o pH, PvCO2, ETCO2 e TIC. Conclui-se que a anestesia geral intravenosa com propofol promove maior estabilidade dos parâmetros respiratórios, hemogasométricos e intracranianos. Sobre os parâmetros cardiovasculares, os efeitos do propofol e isofluorano são semelhantes. Além disso, a ventilação espontânea não é adequada para suínos jovens.
The aim of the present study was to compare the cardiorrespiratory dynamics as well as the intracranial parameters of piglets anesthetized with either total intravenous anesthesia with propofol or inhalation anesthesia with isoflurane and receiving FiO2 of 0,5 and kept under spontaneous ventilation. To that purpose, sixteen animals, males or females, were randomly divided into two groups: GI (Isoflurane and FiO2=0,5) and GP (Propofol and FiO2=0,5). For all pigs, azaperone (2 mg/kg) was used as premedication. In both groups, the animals were induced with intravenous administration of propofol, at the required dose for endotracheal intubation. In GI, after endotracheal intubation, the vaporizer was adjusted to 1.5 MAC. In GP, the maintenance of anesthesia was performed with constant rate infusion of propofol, at rate of 0,5 mg/kg/min. In both groups, hemodynamic, ventilatory and intracranial parameters were evaluated 40 minutes after anesthetic induction (M0), followed by 15-minutes intervals (M15 to M60). The results of parametric variables were analyzed by SAS 9.1 software (2010). In all parameters, there were differences between groups in the respiratory (PvO2, Hbv, PETCO2, f, Vt and Tins), cardiovascular (SBP and TPRI) and intracranial variables (ICP, CPP and ICT). Regarding moments in the same group, there were differences in GI in the respiratory (PaCO2, pH, PvO2, ETCO2, Vm, PAO2 and P(A-a)O2) and intracranial variables (TIC). In GP, significantly differed the pH, PvCO2, ETCO2 and TIC. It is concluded that intravenous anesthesia with propofol promotes better stability of ventilatory, blood gas parameters and intracranial parameters. On cardiovascular parameters, the effects of propofol and isoflurane are similar. Moreover, spontaneous ventilation is not suitable for piglets.
The aim of the present study was to compare the cardiorrespiratory dynamics as well as the intracranial parameters of piglets anesthetized with either total intravenous anesthesia with propofol or inhalation anesthesia with isoflurane and receiving FiO2 of 0,5 and kept under spontaneous ventilation. To that purpose, sixteen animals, males or females, were randomly divided into two groups: GI (Isoflurane and FiO2=0,5) and GP (Propofol and FiO2=0,5). For all pigs, azaperone (2 mg/kg) was used as premedication. In both groups, the animals were induced with intravenous administration of propofol, at the required dose for endotracheal intubation. In GI, after endotracheal intubation, the vaporizer was adjusted to 1.5 MAC. In GP, the maintenance of anesthesia was performed with constant rate infusion of propofol, at rate of 0,5 mg/kg/min. In both groups, hemodynamic, ventilatory and intracranial parameters were evaluated 40 minutes after anesthetic induction (M0), followed by 15-minutes intervals (M15 to M60). The results of parametric variables were analyzed by SAS 9.1 software (2010). In all parameters, there were differences between groups in the respiratory (PvO2, Hbv, PETCO2, f, Vt and Tins), cardiovascular (SBP and TPRI) and intracranial variables (ICP, CPP and ICT). Regarding moments in the same group, there were differences in GI in the respiratory (PaCO2, pH, PvO2, ETCO2, Vm, PAO2 and P(A-a)O2) and intracranial variables (TIC). In GP, significantly differed the pH, PvCO2, ETCO2 and TIC. It is concluded that intravenous anesthesia with propofol promotes better stability of ventilatory, blood gas parameters and intracranial parameters. On cardiovascular parameters, the effects of propofol and isoflurane are similar. Moreover, spontaneous ventilation is not suitable for piglets.
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Palavras-chave
Anestesia geral inalatória, Anestesia geral intravenosa, Fração inspirada de oxigênio, Suíno