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Designed, Produced, and maintained (Edition 12, 2022) by 

Bhavani Shankar Kodali MD

Updated September 2022

Effect of Inhalational Agents

Physics of capnography

Bhavani Shankar Kodali MD


Factors affecting IR Spectrography


Effect of Inhalational agents

Inhalational agents do not affect CO2 measurement

Effect of inhalational agents in IR CO2 absorption


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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