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Author Question: The static pressure-volume curve shown in the figure indicates the presence of which of the ... (Read 57 times)

student77

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on: Jul 16, 2018
The static pressure-volume curve shown in the figure indicates the presence of which of the fol-lowing?
 
  a. Atelectasis
  b. Pneumonia
  c. Pneumothorax
  d. Bronchospasm

Question 2

The pressure at which large numbers of alveoli are recruited in a patient with acute respiratory distress syndrome (ARDS) is located on the static pressure-volume curve at which of the follow-ing points?
 
  a. Upper inflection point
  b. Lower inflection point
  c. Peak inspiratory pressure
  d. Between the lower and upper inflection points


okolip

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

ANS: D
The static compliance (CS) line shown in the figure is normal. However, the dynamic compliance (CD) curve shows that with increasing volumes there are very high pressure increases. This shows a right shift and flattening of the CD curve and is indicative of increasing airway resistance. Bronchospasm causes an increase in airway resistance. Atelectasis, pneumonia, and pneumotho-rax will cause both the CS and CD curves to shift right and flatten.

Answer to Question 2

ANS: B
The lower inflection point marks a significant change in the slope of the curve and may indicate the pressure at which large numbers of alveoli are recruited.


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