Abstract
Artificial respiration was carried out by forced oxygen inspiration on 8 goats under thoracic operation for 60 to 65 minutes. The goats were examined mostly for changes in the gases of the blood.
1. During the thoracic operation, the oxygen in the cycle was 33.10 to. 56.41 (45.37) per cent and the carbon dioxide 0.09 to 1.09 (0.42) per cent.
2. During the operation, the 5- to 10-minute values of the oxygen content and the degree of oxygen saturation of the arterial blood showed a transitional decrease and remained at a level about 5 to 10 per cent lower than the normal (100-minute rate). When oxygen inspiration was suspended after the operation, these values immediately exhibited a distinct decrease. At this time PCO2 showed an increase.
3. During the operation, the carbon dioxide contents of the arterial and venous blood increased gradually. H2CO3 increased at a higher rate than HCO3-in the blood. PCO2 increased and pH became low in value. These changes indicate the occurrence of respiratory acidosis, which seems to be of low degree since HCO3- showed an increase at the same time with H2CO3. It may well be that these results prove the effect of oxygen inspiration applied to the thoracic operation, as compared with the same operation not accompanied by artificial inspiration.
