各種麻酔法の肺含水量に及ぼす影響に関する実験的研究 第4編 酸素欠乏ならびに炭酸ガス蓄積の肺含水量に及ぼす影響に関する実験的研究

To dogs anesthetized with ravonal low oxygen gas was given or accumulation of carbon dioxide was evoked. After that the influence on the water content of the lung was observed and the following results were obtained. 1) In the group to which pure oxygen was given during ravonal intravenous anesthesia, the water content of the lung showed little less than the control. 2) In the group air or 15 vol.% oxygen was given, the water content increased though slightly in degree. The increase was more marked with the latter. 3) With 10 vol.% or 5 vol.% oxygen, the water content of the lung increased markedly. However, in the group inhaled 5 vol.% oxygen than in that with 10 vol.% oxygen, the degree of increase was slighter, because the animals died in the relatively early stage. 4) By carbon dioxide accumulation, too. the water content of the lungs increased markedly. From the above stated data, anoxia and hypercapnia are the most important causes for postoperative acute pulmonary edema and closed circuit anesthesia is often accompanied with the both complications.