A Recirculation System to Reduce the Consumption of Oxygen During CPAP.

Background: During continuous flow CPAP for noninvasive respiratory support, a high flow (eg, 60-90 L/min) of gas with F titratable up to 1.0 is flown within a helmet or face mask, while a PEEP valve maintains the set pressure. A large amount of oxygen is wasted, whereas only a minimal amount is consumed.