Hypothermia in dogs. 1. Experimental studies with special reference to the ether anesthesia.:1. Experimental Studies with Special Reference to the Ether Anesthesia

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A total of 96 dogs were subjected experimentally to surfacecooling low-body-temperature anesthesia by the method of Okamura et al. It was found out that to induce sufficient ether anesthesia was an especially important point in performing this method. Then studies were made on a correlation between the intensity of ether anesthesia and the amount of ether consumed or the velocity of inhalation of ether.<BR>By using an evaporator of Wick type under autonomous respiration, ether with the addition of 0.5 mg/kg of triflupromazine was allowed to be inhaled slowly 5-10 minutes before introducing anesthesia with thiamylal sodium. As a result, the most satisfactory process of anesthesia was obtained when 1 ml/kg of ether was introduced for about 10 minutes, when a total of 2 ml/kg of ether was inhaled for about 20-30 minutes from the introduction to the time of dipping in ice water, and when a total of 3 ml/kg of eter was inhaled for about 40-60 minutes from the time of dipping in ice water to the end of treatment (when esophageal temperature was 25°C or below) . Many of the animals subjected to this process of anesthesia survived for a long time.
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