Monitor mode - Capnography
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Physics principle used
Capnography is a Non-Invasive measurement usually presented by a graph of
expiratory CO
2
plotted against time.
The Microstream method is used in intubated or non-intubated patients. A sample of
the gas exhaled by the patient is collected by cannulas and sent to the Microstream
chamber and sensor inside the CardioMax. CO
2
measurement is based on the
characteristics of laser absorption by CO
2
molecules.
Capnography consists of measuring and registering the carbon dioxide released at
the end of expiration (EtCO
2
). The capnograph is an EtCO
2
analyzer which displays
its concentration or partial pressure both digitally and in graph record. The main
information given by the capnograph are the exhaled CO
2
partial pressure at the
end of expiration, respiratory frequency and the capnogram.
Warnings
Never cut or bend the EtCO
2
sample line. The use of folded or cut sample line
can damage the equipment and prevent proper operation of the module.
The EtCO
2
sample line is disposable and single-use and cannot be reused
under any circumstances.
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