What is the normal relationship between the partial pressure of arterial carbon dioxide (PaCO2) and partial pressure of end-tidal CO2 (PETCO2)?
a. PaCO2 and PETCO2 are equal.
b. PaCO2 is 10 mm Hg more than PETCO2.
c. PaCO2 is 4 to 6 mm Hg less than PETCO2.
d. PaCO2 is 4 to 6 mm Hg more than PETCO2.
ANS: D
Although the partial pressure of end-tidal CO2 (PETCO2) should equal the partial pressure of arte-rial carbon dioxide (PaCO2), the PETCO2 is actually 4 to 6 mm Hg lower than the PaCO2.
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