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1) Polarographic measurements of cerebral oxygen tensions in dogs by using an enamelled Cu-wire as the oxygen electrode were attempted. These dogs were anesthetized with Mintal (pentobarbital sodium) 30 mg per kg B. W., treated under the artifitial respiration, immobilized intermittently or continuouslly with intravenous administrations of Relaxin (syntheticmuscle relaxant, succinyl choline chloride), and controlled at 33° to 39°C of body temperatures by means of electric lamps 1-2 x 100 watt. Concurrent recordings were made of the cerebrospinal fluid pressure through the cisternal puncture, the blood pressure of the femoral artery, and the EEG of the cortical and the thalamic regions. In addition, the arterial blood oxygen tensions were checked by means of the oxygen electrode. 2) The currents in the electrical circuit for the oxygen electrode, representing the polarographic tissue oxygen tensions, may well reflect the blood flows of local tissues in so steady states as the arterial blood oxygen tensions are not changed. The cerebral circulation seemed apparently to be made so constant that, when the blood flow in one region as the thalamus continued to increase or decrease, the circulation in the other as the cortex continued to decrease or increase. The cerebral blood flows well responded to the changes of rather the cerebrospinal fluid pressure than the blood pressure, decreasing and increasing accompanied with rising and falling of the pressures , respectively. However, the thalamic circulation, in contrast with the cortical , could not follow changes of the pressures so fast as the cardiac and respiratory. Since this push-pull relation between the cerebral tissue oxygen tension and the cerebrospical fluid pressure occured remarkably and typically when dogs were suffering from anoxic anoxia, these facts seemed to imply that the cerebral tissues, of which the thalamic region having a greater capacitance hemodynamically must be provided with much more amounts of blood streams than the cortical having a greater resistance hemodynamically , could not be sufficiently satisfied with oxygen from the blood streams flowing into the cerebral tissues steadily.

neurologia medico-chirurgica

S2. The Circulatory and the Metabolic Characteristics of the Cortical and the Thalamic Regions Observed by Application of the Oxygen Electrode to the Dog Brain