FIGURE 1.

In vivo arterial blood oxygen levels in respiratory diseases. (A) Example of arterial oxygen saturation (SaO₂) measured in a patient with obstructive sleep apnea. Reproduced from Farré et al. (1998) with permission of the copyright owner. (B) Example of oxygen partial pressure (PaO₂) in the arterial blood induced by recruitment and de-recruitment in a pig with experimentally induced acute respiratory distress syndrome. Reproduced from Thomas et al. (2017) (http://creativecommons.org/licenses/by/4.0/).