If the air-entrainment port on a Venturi mask is occluded, which of the following will happen? 1. A decrease in flow 2. A decrease in FIO2 3. An increase in flow 4. An increase in FIO2
a. 1 and 2 c. 1 and 4
b. 1 and 3 d. None of the choices
ANS: C
Partial obstruction of oxygen flow downstream of the jet orifice or partial obstruction of the en-trainment ports will decrease the amount of room air entrained, thus raising the FIO2 of the deliv-ered gas.
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