Effect of Inhalational Agents

Physics of capnography

Bhavani Shankar Kodali MD
Factors affecting IR Spectrography



Inhalational agents do not affect CO2 measurement

Inhalational agents absorb IR at lower frequency

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

Carbon dioxide monitors. Health Devices;15:255-85.

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