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1551 Anaesthesia

A 43-year-old trauma patient develops acute respiratory distress syndrome (ARDS) and has difficulty oxygenating despite increased concentrations of inspired O2 . After the positive endexpiratory pressure (PEEP) is increased, the patient’s oxygenation improves. What is the mechanism by which this occurs?

ADecreasing dead-space ventilation
BDecreasing the minute ventilation requirement
CIncreasing tidal volume
DIncreasing functional residual capacity
Anaesthesia
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