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A hipotermia em aves sob anestesia é freqüentemente observada, causando alterações fisiológicas e metabólicas que podem levar ao óbito. O estudo avaliou dois métodos de manutenção térmica em galinhas submetidas à anestesia inalatória com isofluorano. Foram utilizadas seis galinhas, pesando entre 1 e 1,5kg, com idade aproximada de um ano. Os animais foram autocontrole, submetidos a três grupos: controle (GC), não sendo utilizado nada; alumínio (GA), envoltos por papel alumínio comercial; manta (GM), envoltos por uma manta térmica de dupla face de alumínio. Após jejum prévio de quatro horas, as aves foram submetidas à anestesia inalatória por meio de máscara facial com 4V% de isofluorano e mantidas posteriormente com 2V% do mesmo agente inalatório, em um circuito avalvular com umidificador, após intubação endotraqueal. As aves foram mantidas em sala climatizada (26°C) e posicionadas em decúbito lateral. As variáveis mensuradas foram a temperatura corpórea, freqüência cardíaca, freqüência respiratória e saturação de oxihemoglobina, nos momentos zero, 5, 15, 30, 45, 60, 75 e 90 minutos. Tanto no GC quando no GM houve hipotermia aos 15 minutos, acentuando-se até o fim das mensurações. No GA a hipotermia só ocorreu após 45 minutos. Houve bradicardia no GC a partir de 15 minutos, no GM a partir de 30 minutos e no GA somente após 60 minutos. Observou-se bradipnéia no GC após 45 minutos e aos 15 e 30 minutos no GA e GM, respectivamente. Ambos os métodos foram eficientes na manutenção térmica, sendo o alumínio mais eficiente devido a menor variação de parâmetros fisiológicos. Hypothermia in birds under general anesthesia is frequently seen, causing physiologic and metabolic alterations that may lead to death. This study evaluated two thermic maintenance methods in chickens under inhalant anesthesia by isoflurane. Six chickens, weighing between 1 and 1.5kg and with approximately one year old, were submitted to three groups in a random order: CG, control, nothing was used; GA, wrapped in a commercial aluminum paper, and GM, wrapped in a double face blanket of aluminum. After four hour fasting, they were submitted to inhalant anesthesia by facial mask with 4V% of isoflurane, and maintained with 2V% of this gas through a humidifier nonrebreathing circuit after endotracheal intubation. In GM and GA the animals body were wrapped in their totality, exception of the head. Body temperature, heart rate, respiratory rate and oxyhemoglobin saturation were measured at 0, 15, 30, 45, 60, 75 and 90 minutes. In GC and GM hypothermia occur with 15 minutes, staying in constant fall until 90 minutes. The difference in GA with basal level occurs only between 45 to 90 minutes. Bradycardia occurred in control group at 15 minutes, in blanket group at 30 minutes and in aluminum group only at 60 minutes. Bradypnea was observed in GC at 45 minutes, and at 15 and 30 minutes in GA and GM, respectively. No significant alterations were seen for to oxihemoglobin saturation. Both methods employed were effective on thermic maintenance, showing the aluminum more effective due less variation observed in body temperature and heart rate

Manutenção térmica em galinhas domésticas mantidas sob anestesia inalatória com isofluorano