Which of the following is the most likely cause of uneven ventilation?
a. Low set tidal volumes
b. High inspiratory flow rates
c. High mean airway pressures
d. Elevated peak inspiratory pressures
ANS: B
Uneven ventilation is likely to occur with high inspiratory flow. If, for example, the right bron-chus is partially obstructed, most of the gas flow would go to the left lung because gas flow fol-lows the path of least resistance. Consequently, a larger volume enters the left lung, creating higher airway pressures in the left lung compared with the right.
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