Figure 1From: Agent consumption with the Zeus® in the automated closed circuit anesthesia mode with O2/air mixturesCarrier gas characteristics. Total fresh gas flow remained below 200 mL/min (a), but the composition of the fresh gas changed over time: air fresh gas flow (b) decreased, while O2 fresh gas flow (c) increased. The inspired O2 concentration progressively decreased towards the target of 50% (d). Thick lines = median, thin lines = quartiles.Back to article page