Which capnography phase shows a sharp decrease in EtCO2 during inhalation?

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Multiple Choice

Which capnography phase shows a sharp decrease in EtCO2 during inhalation?

Explanation:
Capnography traces CO2 changes across the whole breath, and the moment CO2 drops as you begin to inhale is the inspiratory downstroke. This phase happens at the start of inhalation when fresh air dilutes the CO2-rich alveolar gas, causing a rapid, sharp decrease in EtCO2. The other segments occur during exhalation or between breaths: baseline is the small CO2 level between breaths, the expiratory upstroke is the rise as CO2-rich air leaves the lungs, and the alveolar plateau is the relatively steady CO2 level during most of exhalation. So the sharp decrease during inhalation is the inspiratory downstroke.

Capnography traces CO2 changes across the whole breath, and the moment CO2 drops as you begin to inhale is the inspiratory downstroke. This phase happens at the start of inhalation when fresh air dilutes the CO2-rich alveolar gas, causing a rapid, sharp decrease in EtCO2. The other segments occur during exhalation or between breaths: baseline is the small CO2 level between breaths, the expiratory upstroke is the rise as CO2-rich air leaves the lungs, and the alveolar plateau is the relatively steady CO2 level during most of exhalation. So the sharp decrease during inhalation is the inspiratory downstroke.

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