Figure 9.

NIRS signals and VMR pattern for subject A. Time course of the O₂Hb and CO₂Hb concentration signals for subject A (healthy current smoker) during BH (left panel) and bidimensional VMR pattern (right panel). The signals reveal an uncompensated increase of the CO₂Hb level, that determines a VMR pattern always out of the two bisectors region. Also, the onset of VMR is delayed and the VMR pattern never reaches a plateau condition.