How would lung perfusion in a "zone 1" area best be described?
a. Increased
b. Normal or average
c. Reduced
d. Unaffected
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).
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