How do you recognize endotracheal tube misplacement into the esophagus and what is the immediate management?

• A. Absent or low end-tidal CO2 and absent bilateral breath sounds; stop ventilation, remove ETT, reintubate, confirm tube placement with capnography and auscultation
• B. Normal end-tidal CO2 and bilateral breath sounds
• C. Increase ventilation
• D. Sleep

Answer: (A)

Recognizing esophageal intubation hinges on the absence of exhaled CO2 and poor ventilation indicators after tube placement. If the endotracheal tube is in the esophagus, capnography typically shows little or no end-tidal CO2 and there is no CO2 waveform, with minimal chest rise and absent or diminished breath sounds because air is not reaching the lungs. The correct immediate response is to stop ventilation through the tube, remove it, reattempt intubation into the trachea, and then confirm placement with the reappearance of a CO2 waveform on capnography and bilateral breath sounds on auscultation (ideally also verified by chest imaging when available).

Normal end-tidal CO2 with bilateral breath sounds would indicate the tube is in the trachea, not misplaced, so it does not reflect misplacement. Increasing ventilation without rechecking placement could worsen gastric insufflation and delay correct airway management. Sleeping is not relevant to airway placement.