Which device monitors carbon dioxide concentration during sleep studies?

Which device monitors carbon dioxide concentration during sleep studies?

• A. Pulse oximetry
• B. Thermal sensor
• C. DC amplifier
• D. Capnography

Answer: (D)

Capnography directly measures the amount of carbon dioxide in exhaled breath, providing a real-time CO2 concentration (often as end-tidal CO2) and a corresponding waveform. This makes it the method used to monitor ventilation during sleep studies, helping to detect hypoventilation or apnea events based on gas exchange. Pulse oximetry tracks oxygen saturation, not CO2. A thermal sensor detects airflow through temperature changes but doesn’t quantify CO2. A DC amplifier amplifies electrical signals from EEG/EMG/ECG channels, not gas concentrations. So capnography is the correct choice for monitoring carbon dioxide during sleep studies.

Capnography directly measures the amount of carbon dioxide in exhaled breath, providing a real-time CO2 concentration (often as end-tidal CO2) and a corresponding waveform. This makes it the method used to monitor ventilation during sleep studies, helping to detect hypoventilation or apnea events based on gas exchange.

Pulse oximetry tracks oxygen saturation, not CO2. A thermal sensor detects airflow through temperature changes but doesn’t quantify CO2. A DC amplifier amplifies electrical signals from EEG/EMG/ECG channels, not gas concentrations. So capnography is the correct choice for monitoring carbon dioxide during sleep studies.