How can you confirm endotracheal tube placement in the field when EtCO2 monitoring is available?

• A. A continuous capnography waveform (EtCO2) with bilateral breath sounds and symmetrical chest rise
• B. Visual confirmation of the tube passing through the vocal cords only
• C. Auscultation alone
• D. Chest radiograph

Answer: (A)

End-tidal CO2 monitoring provides real-time evidence that air is moving from the lungs through the tube, which means the tube is in the trachea. When you have this capnography waveform ongoing, you can be confident that the airway is secured and ventilation is reaching the lungs. In the field, pairing that continuous capnography waveform with two quick physical checks reinforces the confirmation: bilateral breath sounds should be present, and the chest should rise symmetrically with ventilation. Together, these signs give fast, reliable confirmation of proper placement and effective ventilation.

Visual confirmation of the tube passing through the vocal cords is helpful but not definitive, because the tube can still be misplaced into the esophagus or shift after placement. Auscultation alone can be misleading due to ambient noise or misinterpretation of sounds. Chest radiograph is useful for formal confirmation but isn’t practical for immediate field verification.