Sidestream Capnograph

The most common type of capnograph are the sidestream type, where the sample gas is drawn from the main respiratory flow through a side port via a narrow tube to the sample cuvette (flow rates between 50 and 500 ml/min). Following CO2 measurement, the gas is either returned to the expiratory limb of the breathing circuit (of particular relevance to low flow anaesthesia) or scavenged.

• Advantages—generally more convenient than mainstream monitors; the patient attachment is less bulky, and more robust

• Disadvantages—without elaborate water traps/filters to remove water vapour, the measured value of ETCO2 would be invalid. A suction pump transfers the sample from the site of sampling to the measurement chamber; this sampling rate can in itself introduce error. The response time of these instruments tends to be longer than mainstream analysers

Capnograph Trace

Figure CM.34 Capnograph trace

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Figure CM.34 Capnograph trace

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