Figure 3.

Example of fresh gas flow management by the Zeus^® and resulting inspired O₂ (F_IO₂), end-expired N₂O (F_AN₂O), and N₂ (F_IN₂) concentrations. Note how during automated administration the FGF of O₂ and N₂O (right Y-axis, logarithmic scale) is increased whenever F_IN₂ increases above a threshold value of approximately 15% (grey arrows).