Relation between mixed venous oxygen saturation and cerebral oxygen saturation measured by absolute and relative near-infrared spectroscopy during off-pump coronary artery bypass grafting

Considering the important time delay with SmvO2, rScO2 seems to reflect more appropriately acute haemodynamic alterations. This might suggest its use as a valid alternative to invasive monitoring of tissue oxygen saturation. Relative and absolute rScO2 measurements demonstrated significant differences in measured rScO2 values and in the magnitude of rScO2 changes during haemodynamic alterations.