Introductory Capnography Concepts

Introductory Capnography Concepts

Capnography is a term that refers to the combination of capnometry (measurement) with the capnogram (graphical representation).

End-tidal CO2 is the instantaneous measurement of the maximum partial pressure of CO2 in an exhaled breath.


Colorimetric CO2 measurement devices can only represent an approximation of end-tidal CO2.

Normal EtCO2 is 35mmHg-45mmHg.

The partial pressure of a given gas can be understood as “the part of the total pressure contributed by the gas”

for example:

A baloon contains a mixture of gases at 100 mmHg.

The mixture of gases includes 25% argon.

The partial pressure of argon is 25 mmHg 


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