Accuracy Verification of the INVOS PM7100

The study objectives require placement of a jugular venous bulb catheter and radial arterial line placement with ultrasound guidance. Two INVOS™ sensors (PMSENS71-A) will be placed bilaterally on the subject's forehead and two on the calf. The INVOS™ device will be evaluated for a targeted range of 70-100% SpO2 levels. Hypoxic mixtures of gas are delivered, and data are collected at approximately (\~) 5-minute intervals during steady periods of increasing and decreasing oxygen concentration.