STUDIES OF ANESTHESIA COMBINED WITH THIOPENTAL SODIUM AND CHLORAL HYDRATE ON CATTLE

Five healthy cattle were injected intravenously both thiopental sodium and chloral hydrate as a combined anesthesia. Each of the cattle were used twice in this experiments. And then, from which the following results were obtained. 1) Thiopental sodium that were the first anesthetic were administered them a dose of 10 mg/kg of body weight. In four cases of ten, surgical anesthesia stage (III3) was maintained for 5-10 minutes. Fifteen minutes later, then chloral hydrate were administered them (An average volume was 71.4mg/kg.), until surgical anesthesia stage (III3) was obtained. Consequently, surgical anesthesia was obtained for 10-20 minutes in eight cases of ten. 2) During the combined anesthesia, body temperature of all the subjects fell slowly and pulse rate usually increased. Five minutes after the administration of chloral hydrate, pulse rate reached a value 2.3 times higher than the preanesthesia. Respiratory rate generally increased but both tidal volume and minute volume decreased. 3) The mean values of blood gases and acid-base balance in arterial blood showed the largest changes ten minutes after the administration of chloral hydrate ; pH was 0.088 lower, PCO2 was 30% higher, PO2 was 33.7% lower and O2 saturation decreased 10% than the preanesthesia. Plasma bicarbonate hardly changed during the combined anesthesia. Therefore, in view of these facts, it appeared that respiratory acidosis was occured within the scope of the compensation. 4) The erythrocyte, hemoglobin content and the hematocrit, Na+, K+ and Clin the plasma electrolyte did not show much changes. The value of the blood sugar clearly increased 37% higher than preanesthesia.