Which capnography phase represents respiratory baseline with no expired CO2?

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Multiple Choice

Which capnography phase represents respiratory baseline with no expired CO2?

Explanation:
Capnography traces have distinct segments that align with parts of the breathing cycle. The baseline represents the portion where CO2 is essentially zero, reflecting inspired gas or dead-space gas with no expired CO2. This is why it’s described as the respiratory baseline with no CO2 being expelled. The upstroke shows the rapid rise as CO2-rich alveolar gas begins to be exhaled, the alveolar plateau is the relatively steady CO2 level from alveolar gas during most of the exhale, and the downstroke is the fall in CO2 as exhalation finishes and the next breath begins. So the baseline segment is the part that indicates no expired CO2.

Capnography traces have distinct segments that align with parts of the breathing cycle. The baseline represents the portion where CO2 is essentially zero, reflecting inspired gas or dead-space gas with no expired CO2. This is why it’s described as the respiratory baseline with no CO2 being expelled. The upstroke shows the rapid rise as CO2-rich alveolar gas begins to be exhaled, the alveolar plateau is the relatively steady CO2 level from alveolar gas during most of the exhale, and the downstroke is the fall in CO2 as exhalation finishes and the next breath begins. So the baseline segment is the part that indicates no expired CO2.

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