The total flow for a 50 air-entrainment mask running at 8 L/min ...

[Arii_bell]

The total flow for a 50 air-entrainment mask running at 8 L/min is _____ L/min.
 
  a. 18 c. 25
  b. 22 d. 30

Question 2

Which of the following O2 devices has 2 one-way valves and the second valve is at the exhala-tion ports, which prevents room air from entering the mask during inhalation?
 
  a. Nonrebreathing mask c. Aerosol tracheost-omy collar mask
  b. Partial rebreathing mask d. Simple mask

[Jordin Calloway]

Answer to Question 1

ANS: B
100 O2  50 = 50. 20 air  50 FIO2 = 30. 30:50 = 1:1.7. For every 1 L/min of O2, there is 1.7 L/min of air being entrained. 1 + 1.7 = 2.7  8 = 21.6 L/min total flow.

Answer to Question 2

ANS: A
The first set of valves is a one-way valve located between the reservoir bag and the base of the mask. This valve allows gas flow to enter the mask from the reservoir bag when the patient in-hales and prevents gas flow from the mask flowing back into the reservoir bag during the pa-tient's exhalation. The second set of valves is at the exhalation ports. The one-way valves placed there prevent room air from entering the mask during inhalation. They also allow the patient's exhaled gases to exit the mask during exhalation.