Modern monitors to measure ETCO2 make use of
Correct Answer: Infrared absorption spectroscopy
Description: Measurements of variations in the respiratory cycle of expired carbon dioxide by displayed waveform and by absolute numerical values is defined as Capnography and Capnometry respectivelyMeasurement of the exhaled CO2 at the level of upper airway at the end of expiration (when CO2 is at its maximum) is referred to as 3end tidal CO2 (EtCO2)Modern monitors used to measure EtCO2 in the exhaled air make use of infrared absorption spectroscopy(Refer: Morgan and Mikhail's Clinical Anaesthesiology, 5th edition, pg no. 126)
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