Which of the following measurements correlates well with a patient's end-tidal CO2 value?
A. HCO?B. Paco2?C. Sao2
D. Pvco2
ANS: B
A. Incorrect response: See explanation B.
B. Correct response: A common gas concentration measurement is the exhaled CO2 concentration using infrared absorption technology. The CO2 at end-expiration (end-tidal CO2) correlates with the arterial CO2, and can be used to trend ventilation effectiveness when the tidal volume and the expiratory time are held nearly constant.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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