Which statement best describes end-tidal CO2 monitoring after intubation?

Which statement best describes end-tidal CO2 monitoring after intubation?

• A. It helps confirm tube placement and evaluate ventilation
• B. It replaces auscultation entirely
• C. It measures arterial oxygen levels only
• D. It is unnecessary in the first minute

Answer: (A)

End-tidal CO2 monitoring provides real-time information on ventilation and confirms airway placement by detecting CO2 in exhaled breath. When the endotracheal tube is in the trachea, a CO2 waveform appears and a measurable ETCO2 value is present, showing that ventilation is occurring. This makes it a rapid, reliable check right after intubation to verify the tube is not in the esophagus and to monitor ongoing ventilation as changes happen. ETCO2 is not meant to replace auscultation. You still listen and observe for bilateral breath sounds and chest rise to assess ventilation distribution and identify other issues that capnography alone can’t reveal. It also doesn’t measure arterial oxygen levels—oxygenation is monitored separately with pulse oximetry and can be assessed more directly with arterial blood gas measurements if needed. Finally, it is important in the first minute and beyond to promptly identify misplacement or ventilation problems, so it should be used immediately after intubation rather than considered unnecessary.

End-tidal CO2 monitoring provides real-time information on ventilation and confirms airway placement by detecting CO2 in exhaled breath. When the endotracheal tube is in the trachea, a CO2 waveform appears and a measurable ETCO2 value is present, showing that ventilation is occurring. This makes it a rapid, reliable check right after intubation to verify the tube is not in the esophagus and to monitor ongoing ventilation as changes happen.

ETCO2 is not meant to replace auscultation. You still listen and observe for bilateral breath sounds and chest rise to assess ventilation distribution and identify other issues that capnography alone can’t reveal. It also doesn’t measure arterial oxygen levels—oxygenation is monitored separately with pulse oximetry and can be assessed more directly with arterial blood gas measurements if needed. Finally, it is important in the first minute and beyond to promptly identify misplacement or ventilation problems, so it should be used immediately after intubation rather than considered unnecessary.