Which option correctly identifies the monitoring method that uses exhaled CO2 measurement to assess ventilation?

Which option correctly identifies the monitoring method that uses exhaled CO2 measurement to assess ventilation?

• A. Pulse Oximetry
• B. Blood Gas Analysis
• C. Capnography
• D. X-ray

Answer: (C)

Capnography measures exhaled carbon dioxide to assess ventilation in real time. It tracks CO2 throughout the breathing cycle and presents a capnogram waveform, with the end-tidal CO2 value showing the CO2 level at the end of expiration. This provides immediate feedback on how effectively a patient is ventilating and whether the airway is patent. It’s especially useful for confirming airway device placement and quickly detecting problems like apnea, hypoventilation, disconnection, or changes in ventilation. Pulse oximetry looks at oxygen saturation, not ventilation; blood gas analysis requires a blood sample and gives PaCO2 as a snapshot rather than continuous monitoring; X-ray shows anatomy rather than real-time ventilation status.

Capnography measures exhaled carbon dioxide to assess ventilation in real time. It tracks CO2 throughout the breathing cycle and presents a capnogram waveform, with the end-tidal CO2 value showing the CO2 level at the end of expiration. This provides immediate feedback on how effectively a patient is ventilating and whether the airway is patent. It’s especially useful for confirming airway device placement and quickly detecting problems like apnea, hypoventilation, disconnection, or changes in ventilation. Pulse oximetry looks at oxygen saturation, not ventilation; blood gas analysis requires a blood sample and gives PaCO2 as a snapshot rather than continuous monitoring; X-ray shows anatomy rather than real-time ventilation status.