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Author Question: In what portion of the lungs does alveolar dead space normally occur? a. Apexes b. Bases c. ... (Read 66 times)

mynx

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on: Jul 16, 2018
In what portion of the lungs does alveolar dead space normally occur?
 
  a. Apexes
  b. Bases
  c. Middle portions of the lungs
  d. Terminal respiratory units

Question 2

Which is the correct formula to calculate the alveolar minute ventilation of a spontaneously breathing subject?
 
  a. f  VDS/VT
  b. f  VT
  c. f  (VT  VDSphys)
  d. f  (VT + VDSphys)


micaelaswann

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

ANS: A
In the normal upright subject at rest, alveoli at the apexes of the lungs have minimal or no perfu-sion, and thus contribute to the total volume of dead space ventilation.

Answer to Question 2

ANS: C
Physiologic dead space includes both the normal and abnormal components of wasted ventila-tion. VDphy is the preferred clinical measure of ventilation efficiency. Measuring VDphy more accu-rately assesses alveolar ventilation.


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mynx

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Reply #2 on: Jul 16, 2018
Thank you :)


micaelaswann

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Reply #3 on: Jul 16, 2018
Happy to help you


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