The area represented by the letter "Y" in the figure is which of the following?

A) End-tidal carbon dioxide (EtCO₂)
B) Alveolar ventilation
C) Alveolar dead space
D) Airway dead space

Question

The area represented by the letter "Y" in the figure is which of the following?

A) End-tidal carbon dioxide (EtCO₂) 
B) Alveolar ventilation 
C) Alveolar dead space 
D) Airway dead space

Quizplus · Accepted Answer

The end-tidal carbon dioxide (EtCO₂)is represented by the very end of the waveform.The alveolar ventilation is represented by the area under the curve,which is "X." The alveolar dead space is represented by the difference between the arterial partial pressure of carbon dioxide (PₐCO₂)and the EtCO₂ line,which is "Y." The airway dead space is represented by "Z."

The Area Represented by the Letter "Y" in the Figure