Fig. 3
From: The Importance of Neuromonitoring in Non Brain Injured Patients
Near infrared spectroscopy. This figure represents two possible traces, one with normal values and the other with abrupt decrease in regional oxygen saturation (rSO2) values. ΔO2Hbi index associated with variation of the oxygenated component of the hemoglobin in the total calculation of rSO2 (arterial component of rSO2), ΔHHbi an index associated with variation of the deoxygenated component of hemoglobin within the total calculation of rSO2 (venous component of rSO2), ΔcHbi is the sum of ΔHHbi + ΔO2Hbi. SpO2—rSO2 is the difference between the value of peripheral saturation of oxygen (SpO2) and rSO2