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Chapter16 CO2 Monitoring
16.1 General
The contents of this section are just the descriptions of the ways of measurement by sidestream
and mainstream CO
2
modules, which are different from the working mode of CO
2
measured in an
anesthetic gas (AG). Please note their differences.
This instrument measures the CO
2
pressure of the patient's air circuit, can measure the content of
end-of-respiration CO
2
(EtCO
2
), the content of minimum CO
2
intake (Ins CO
2
), and the airway
respiration rate (AWRR), and display the CO
2
pressure waveform.
Monitors using the way of CO
2
measurement are divided into sidestream monitors and mainstream
monitors.
In the side-stream measurement mode, the respiratory gases through patient airways are
sampled with a constant sampling flows and analyzed by remote CO
2
sensors built in the
measurement system.
In the mainstream measurement mode, CO
2
sensors are mounted on an airway joint that is
directly inserted into the respiratory system of a patient.
CO
2
measurement provides:
• CO
2
waveform.
• End-of-respiration CO
2
(EtCO
2
): CO
2
value measured at the end of respiration.
• Minimum CO
2
intake (Ins CO
2
): The minimum value measured during respiration.
• Airway Respiration Rate (AWRR): respiration rate per minute derived from CO
2
waveform.
Warning
The bumping and shaking of the CO
2
module should be avoided whenever possible.
Attention
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