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

Question

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

Quizplus · Accepted Answer

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 depicts 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.

The Partial Pressure of End-Tidal Carbon Dioxide (PₑₜCO₂)reading Is Taken