What is the most reliable methods of monitoring ET tube placement?

• A. ETCO2 and capnography
• B. Auscultation
• C. Chest X-ray
• D. Breath sounds

Answer: (A)

End-tidal CO2 monitoring with capnography is the most reliable way to confirm and continuously verify endotracheal tube placement because it provides real-time evidence of gas exchange in the lungs. A proper tracheal placement produces a characteristic capnography waveform and a consistent end-tidal CO2 value, indicating ventilation is reaching the lungs. If the tube is in the esophagus, CO2 is absent or very low and the waveform is flat, signaling immediate need to reposition.

Auscultation, breath sounds, and chest X-ray have limitations. Listening for chest sounds or breath sounds can be misleading due to noise, patient anatomy, secretions, or lung disease, and may not reliably distinguish tracheal from esophageal placement. Chest X-ray confirms placement but is not immediate and may delay detection of tube movement during transport or ongoing care.

In practice, use capnography as the primary verification method, and supplement with clinical assessment and imaging when available for final confirmation.