What is the minimum flow setting for a simple mask applied to an ...

[Mr. Wonderful]

What is the minimum flow setting for a simple mask applied to an adult?
 
  a. 3 L/min
  b. 5 L/min
  c. 8 L/min
  d. 10 L/min

Question 2

A 52-year-old man is admitted to the hospital emergency department with a primary complaint of severe radiating chest pain and signs of central cyanosis.
 
  The attending asks for your advice on selecting a device that provides a moderate FiO2 for this patient. Which of the following would you recommend?
  a. Simple O2 mask at 8 L/min
  b. Air-entrainment mask at 40 O2
  c. Nasal cannula at 5 L/min
  d. Nonrebreathing mask at 10 L/min

[Ahernandez18]

Answer to Question 1

ANS: B
At a flow less than 5 L/min, the mask volume acts as dead space and causes CO2 rebreathing.

Answer to Question 2

ANS: A
Table 41-3 lists the FiO2 range, FiO2 stability, advantages, disadvantages, and best use of each of these devices.