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Waveform Capnography 24
Waveform capnography is not sensitive enough to detect main bronchus intubation.
Even when the ET tube is seen to pass through the vocal cords and the tube position is verified by chest expansion and auscultation during positive-pressure ventilation, you should obtain additional confirmation of placement by using continuous quantitative waveform capnography or a qualitative device like a colorimetric PETCO2 detector or EDD.
However, because no single confirmation technique is completely reliable, particularly when cardiac arrest is present, the AHA recommends the use of continuous waveform capnography, in addition to clinical assessment, as the most reliable method of confirming and monitoring the correct placement of an ET tube.
If waveform capnography is not available, EDD or nonwaveform PETCO2 monitor, in addition to clinical assessment, should be used to confirm ET tube placement.
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