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Author Question: How would lung perfusion in a zone 1 area best be described? a. Increased b. Normal or average ... (Read 98 times)

altibaby

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on: Jul 16, 2018
How would lung perfusion in a zone 1 area best be described?
 
  a. Increased
  b. Normal or average
  c. Reduced
  d. Unaffected

Question 2

How does the lung respond to regional lung hypoxia?
 
  a. Bronchial artery vasoconstriction
  b. Bronchial artery vasodilation
  c. Pulmonary artery vasoconstriction
  d. Pulmonary artery vasodilation


nyrave

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

ANS: C
Areas that experience higher airway pressure (e.g., during positive pressure ventilation) that equal or exceed local arteriole and capillary pressure will have reduced blood flow as a result of the opposing airway pressure (zone 1 airways).

Answer to Question 2

ANS: C
Areas of regional lung hypoxia, as the result of reduced ventilation, congestion, and/or airway obstruction, can result in local pulmonary arterial vasoconstriction and cause blood flow to be shifted from these areas toward areas of higher O2 content and pulmonary vasodilation.


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