The Difficult Airway

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Confirmation Devices

ETCO2 Detectors (Colorimetric Device)

  • There are a variety of colorimetric devices on the market and the majority contain three-color ranges that are based upon percent to verify proper placement of the advanced airway.

Normal ETCO2 %

  • A normal ETCO2 is greater than 4%, therefore, based on the table below a color change to Yellow would indicate the proper amount of carbon dioxide.  A simple way to remember this is "Yellow means Yes."

Color

ETCO2 %

Purple

Less than 0.5

Tan

0.5 " 2

Yellow

Greater than 2

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