Which option expands EtCO2?

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Multiple Choice

Which option expands EtCO2?

Explanation:
EtCO2 expands to End-tidal carbon dioxide. End-tidal refers to the CO2 present at the end of an exhalation, which is the gas sampled by capnography. This final-breath CO2 value reflects the alveolar CO2 and gives a noninvasive way to assess ventilation and perfusion. The other options misstate either the gas involved (carbon monoxide) or the terminology (carbonic dioxide) or add a descriptor about measuring rather than the gas itself. The correct expansion is simply End-tidal carbon dioxide.

EtCO2 expands to End-tidal carbon dioxide. End-tidal refers to the CO2 present at the end of an exhalation, which is the gas sampled by capnography. This final-breath CO2 value reflects the alveolar CO2 and gives a noninvasive way to assess ventilation and perfusion. The other options misstate either the gas involved (carbon monoxide) or the terminology (carbonic dioxide) or add a descriptor about measuring rather than the gas itself. The correct expansion is simply End-tidal carbon dioxide.

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