Under normal situations, the normal ventilation to perfusion ratio is 4:5 (0.8). Atelectasis can cause a shunt-producing ventilation/perfusion mismatch. This occurs primarily as a result of
a. perfusion exceeding ventilation.
b. ventilation exceeding perfusion.
c. an alveolus that is receiving ventilation but not perfusion.
d. an alveolus that is receiving perfusion but not ventilation.
A
A shunt-producing ventilation/perfusion mismatch is one in which perfusion exceeds ventilation. Whereas situations in which ventilation exceeds perfusion V/Q greater than 0.8 are considered to be dead space producing, situations in which perfusion exceeds ventilation V/Q less than 0.8 are considered to be shunt producing.
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