Field Internship Student Data Acquisition Project. (FISDAP) Airway Practice Exam

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When using a capnography device, what aspect of respiration is primarily measured?

Oxygen intake
End-tidal CO2
Heart rate
Respiration depth

The correct answer is: End-tidal CO2

The primary measurement obtained from a capnography device is end-tidal CO2. Capnography is specifically designed to measure the concentration of carbon dioxide in the exhaled air at the end of expiration, known as end-tidal CO2. This measurement is crucial as it reflects the respiratory rate and efficiency of ventilation, providing insight into a patient’s metabolic and respiratory status. By analyzing end-tidal CO2 levels, healthcare professionals can assess whether a patient is properly ventilating and can monitor conditions such as hypoventilation, hyperventilation, or other respiratory concerns. The device captures the CO2 produced by cellular metabolism and allows clinicians to evaluate how well CO2 is being eliminated from the body through the lungs. Other options such as oxygen intake, heart rate, and respiration depth are not directly measured by capnography, as it focuses specifically on the carbon dioxide levels during the respiratory cycle.