A simple mask can deliver what percentage of FIO2 at how many ...

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A simple mask can deliver what percentage of FIO2 at how many liters/minute?
 
  a. 0.24 to 0.44 at 1-6 L/min c. 0.40 to 0.60 at 10-15 L/min
  b. 0.35 to 0.50 at 5-10 L/min d. 0.50 to 0.80 at 5-10 L/min

Question 2

The main goal of a pulse-demand oxygen-delivery system is which of the following?
 
  1. To provide oxygen only during expiration
  2. To provide oxygen only during inspiration
  3. To deliver oxygen to the patient only after a sufficient inspiratory effort is made and the de-mand valve opens
  4. To deliver oxygen at a preset flow rate and close during inspiration to conserve oxygen
  a. 1 and 3 c. 2 and 3
  b. 2 and 4 d. 1 and 4

[fauacakatahaias]

Answer to Question 1

ANS: B
The simple mask can deliver a higher concentration than a nasal cannula because of the volume of the mask itself. That volume serves as an extension of the anatomic reservoir. The simple mask is generally said to be able to deliver 0.35 to 0.50 at oxygen flows of 5 to 10 L/min.

Answer to Question 2

ANS: C
Pulse-demand oxygen-delivery systems deliver oxygen to the patient on demand only during in-spiration. Oxygen is delivered to the patient only after a sufficient inspiratory effort is made and the demand valve opens. The demand valve closes during exhalation to conserve oxygen.

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Gracias!

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TYSM