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During the performance of a series of anoxemia tests the oxygen saturation of the blood has been determined by means of the Millikan oximeter. The levels of hypoxemia induced have been correlated with various other factors. The results are considered with particular reference to a possible critical range, within which changes in the circulation occur.

Correlation of the Oxygen Saturation of the Blood and Changes in the Electrocardiogram, Blood Pressure, and Heart Rate During the Anoxemia Test