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Physics of capnography
Bhavani Shankar Kodali MD
Factors affecting IR Spectrography
Inhalational agents do not affect CO2 measurement
The low concentrations of halogenated anaesthetic agents used during anaesthesia absorb IR energy at different wave lengths (around 3.3 milli microns) and their interference is not considered to be important.1
Reference:
Carbon dioxide monitors. Health Devices;15:255-85.