Which instrument is most reliable for confirming endotracheal tube placement during resuscitation?

Which instrument is most reliable for confirming endotracheal tube placement during resuscitation?

• A. Waveform capnography
• B. Pulse oximetry
• C. Colorimetric end-tidal CO2 detector
• D. Laryngoscope

Answer: (A)

Waveform capnography is the most reliable way to confirm endotracheal tube placement during resuscitation because it provides real-time, objective evidence of exhaled carbon dioxide. The waveform appears only when the tube is in the trachea and breath is reaching the lungs, giving immediate feedback on placement and ventilation effectiveness. This is especially important during CPR, when poor perfusion can make other indicators misleading. A continuous capnography trace not only confirms that the airway is ventilated but also helps gauge CPR quality and detect tube dislodgement or esophageal intubation early. In contrast, a colorimetric detector can be fooled by low perfusion and may not reliably reflect ongoing ventilation. Pulse oximetry shows oxygenation and lags behind ventilation status, so it does not confirm tube position. A laryngoscope can verify tube placement at the moment of intubation, but it does not provide ongoing confirmation once there is movement and ongoing chest compressions.

Waveform capnography is the most reliable way to confirm endotracheal tube placement during resuscitation because it provides real-time, objective evidence of exhaled carbon dioxide. The waveform appears only when the tube is in the trachea and breath is reaching the lungs, giving immediate feedback on placement and ventilation effectiveness. This is especially important during CPR, when poor perfusion can make other indicators misleading. A continuous capnography trace not only confirms that the airway is ventilated but also helps gauge CPR quality and detect tube dislodgement or esophageal intubation early.

In contrast, a colorimetric detector can be fooled by low perfusion and may not reliably reflect ongoing ventilation. Pulse oximetry shows oxygenation and lags behind ventilation status, so it does not confirm tube position. A laryngoscope can verify tube placement at the moment of intubation, but it does not provide ongoing confirmation once there is movement and ongoing chest compressions.