The partial pressure of end-tidal carbon dioxide (PetCO2) reading is taken at what point in the figure?
a. Point A
b. Point B
c. Point C
d. Point D
ANS: C
Point C shows the concentration of carbon dioxide (CO2) at the end of the alveolar phase, just before inspiration begins. This occurs in phase 3 of the four phases of a capnogram. Point A de-picts phase 1, which is the initial gas exhaled from the conducting airways. As a person exhales, the amount of CO2 in the exhaled gas increases. The amount of CO2 exhaled levels off at point B. This coincides with phase 4 or the alveolar plateau. Point D is showing the fall in CO2 that occurs during inspiration.
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