What device is used to measure the amount of expired carbon dioxide?

The device used to measure the amount of expired carbon dioxide is referred to as a capnometer. This instrument specifically quantifies the concentration of carbon dioxide in exhaled air, which is critical for assessing a patient's respiratory function, metabolic state, and effectiveness of ventilation.

Capnometers operate by using infrared light technology to analyze the gas composition of exhaled breath, providing real-time feedback on the levels of carbon dioxide. This information is vital during various medical emergencies and procedures, such as intubation and monitoring of patients under sedation or anesthesia.

Understanding the role of a capnometer is essential in emergency care, as it can help in diagnosing conditions such as respiratory distress or confirming proper placement of an endotracheal tube by ensuring that CO2 is being exhaled from the lungs.