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Anaesthesia General 32616cbb

In a variable performance face mask

A
High patient inspiratory flow rate reduces oxygen concentration
B
Oxygen concentration decreases during an expiratory pause
C
Carbon dioxide concentration decreases during an expiratory pause
D
Side holes allow venting of expired gases and entrainment of air.
High-Yield Explanation
During expiratory pause, there is no tidal  flow from the patient, oxygen accumulates in the mask, thereby washing out carbon dioxide.

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