A METHOD AND APPARATUS TO ATTAIN AND MAINTAIN TARGET END TIDAL GAS CONCENTRATIONS

摘要

In a first aspect, the invention relates to an apparatus for inducing or maintaining a target end tidal concentration of a gas in a subject comprisin g a breathing circuit, a source of gas flow into the circuit, means for controlling the rate of the source of gas flow into the circuit and means fo r controlling the concentration of gases in the source gas flow independently from each other. In another aspect, the invention relates to a method of preparing an apparatus for inducing or maintaining a target end tidal concentration of a gas X in a subject comprising selecting a rate of a sourc e gas flow into a breathing circuit, selecting the concentration of at least o ne constituent gas of a component gas making up the source gas to a level corresponding to the end tidal concentration of the gas X, whereby the apparatus is adapted to administer a source gas having a first gas compositi on