Which end-tidal CO2 range is considered normal?

Prepare for the NBRC TMC Exam by reviewing essential normal values. Enhance your understanding with multiple-choice questions featuring detailed explanations and hints. Ensure your readiness for success!

Multiple Choice

Which end-tidal CO2 range is considered normal?

Explanation:
End-tidal CO2 is the CO2 level measured at the end of expiration and it mirrors alveolar ventilation. In healthy adults, the normal range is 35-45 mmHg, because ETCO2 is usually very close to arterial CO2 (PaCO2) with only a small gradient (about 2-5 mmHg) due to the dead space in the ventilated air. Values outside this window suggest ventilation or perfusion issues: higher ETCO2 implies hypoventilation or rebreathing, while lower ETCO2 indicates hyperventilation or reduced CO2 delivery. Among the given options, 35-45 mmHg best represents the normal range.

End-tidal CO2 is the CO2 level measured at the end of expiration and it mirrors alveolar ventilation. In healthy adults, the normal range is 35-45 mmHg, because ETCO2 is usually very close to arterial CO2 (PaCO2) with only a small gradient (about 2-5 mmHg) due to the dead space in the ventilated air. Values outside this window suggest ventilation or perfusion issues: higher ETCO2 implies hypoventilation or rebreathing, while lower ETCO2 indicates hyperventilation or reduced CO2 delivery. Among the given options, 35-45 mmHg best represents the normal range.

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