The concentration of oxygen delivered to the patient with an air-entrainment mask depends on which of the following?
1. Flow of the oxygen exiting the jet nozzle
2. Size of the jet nozzle outlet
3. Size of the entrainment port
4. Size of the Venturi mask
a. 1, 2, and 3 c. 1, 2, and 4
b. 2, 3, and 4 d. 3 and 4
ANS: A
Oxygen flowing through the jet nozzle of an air-entrainment device "drags" in room air through the entrainment ports as a result of viscous, shearing forces between the gas exiting the jet nozzle outlet and the surrounding ambient air. The concentration of oxygen delivered to the patient, therefore, depends on the flow of oxygen exiting the jet nozzle, the size of the jet nozzle outlet, and the size of the entrainment ports.
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