What is the significance of monitoring ETCO2 during airway management?

• A. It reflects oxygen saturation.
• B. It directly measures airway temperature.
• C. It helps confirm the effectiveness of ventilation and airway placement.
• D. It indicates blood pressure.

Answer: (C)

Monitoring ETCO2 provides real-time feedback on both ventilation effectiveness and airway placement. The end-tidal CO2 measurement reflects the CO2 concentration in the gas being exhaled at the end of each breath, so a consistent capnography waveform with a normal ETCO2 range indicates that gas is flowing through the lungs and that the airway tube is properly positioned in the trachea. If the tube were misplaced in the esophagus, CO2 would be absent or very low and the waveform would be flat, signaling improper placement. Additionally, changes in ETCO2 over time mirror how well ventilation and perfusion are delivering and removing CO2 from the lungs, so rising or falling values help you gauge if ventilation is adequate or if adjustments are needed. This is distinct from oxygen saturation, airway temperature, or blood pressure, which are monitored by other means.