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Author Question: During a single-breath capnogram, what does the occurrence of a plateau indicate? a. Exhalation ... (Read 9 times)

waynest

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on: Jul 16, 2018
During a single-breath capnogram, what does the occurrence of a plateau indicate?
 
  a. Exhalation of mainly dead space gas
  b. Inspiration of fresh respiratory gas
  c. Exhalation of mixed alveolar and dead space gas
  d. Exhalation of mainly alveolar gas

Question 2

At the very beginning of exhalation, the PETCO2 normally should be at what level?
 
  a. 0 mm Hg
  b. 15 mm Hg
  c. 25 mm Hg
  d. 40 mm Hg


nital

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: D
This plateau indicates exhalation of gas coming mainly from ventilated alveoli.

Answer to Question 2

ANS: A
Initially, the expired PCO2 is 0 mm Hg, indicating exhalation of pure dead space gas.


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