Oxygen Saturation Changes During Hyperoxic and Hypercapnic Stimuli Measured by Near Infrared Spectroscopy (NIRS) Cerebral Oximetry

A dual-gas hypercapnia/hyperoxia paradigm as used in quantitative physiological MRI was performed while subjects were monitored with a NIRS cerebral oximeter, a finger-clip pulseox, and respiratory gas analyser to obtain arterial and tissue oxygen saturation levels. Increases in arterial and venous saturations were found by combining the group data that could not be measured in individuals. This has implications for the use of the Davis model in calibrated fMRI.

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