What is end-tidal CO2 (ETCO2), and why is it monitored during general anesthesia?

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Multiple Choice

What is end-tidal CO2 (ETCO2), and why is it monitored during general anesthesia?

End-tidal CO2 is the CO2 concentration measured at the end of an exhaled breath, obtained with capnography. During general anesthesia, it provides real-time feedback on ventilation: how effectively the lungs are removing CO2 and whether the airway and ventilation system are functioning properly. A normal capnography trace and ETCO2 value (typically about 35–45 mmHg in adults) indicate adequate alveolar ventilation and a functioning airway. Sudden changes can signal problems such as hypoventilation, apnea, airway obstruction, a disconnection, or equipment failure, and a quick rise can reflect rebreathing or increased CO2 production, while a drop can indicate disconnection or impaired ventilation. ETCO2 is not a direct measure of arterial CO2, and it does not assess oxygen saturation (that’s pulse oximetry) or blood pressure.

End-tidal CO2 is the CO2 concentration measured at the end of an exhaled breath, obtained with capnography. During general anesthesia, it provides real-time feedback on ventilation: how effectively the lungs are removing CO2 and whether the airway and ventilation system are functioning properly. A normal capnography trace and ETCO2 value (typically about 35–45 mmHg in adults) indicate adequate alveolar ventilation and a functioning airway. Sudden changes can signal problems such as hypoventilation, apnea, airway obstruction, a disconnection, or equipment failure, and a quick rise can reflect rebreathing or increased CO2 production, while a drop can indicate disconnection or impaired ventilation. ETCO2 is not a direct measure of arterial CO2, and it does not assess oxygen saturation (that’s pulse oximetry) or blood pressure.

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