A patient receiving 35% O2 through an air-entrainment mask set at 6 L/min input flow becomes tachypneic
Simultaneously, you notice that the SpO2 has fallen from 91% to 87%. Which of the following actions would be most appropriate in this situation?
a. Switch the patient to a 40% air-entrainment mask.
b. Increase the device's input flow to 10 L/min.
c. Switch the patient to a 28% air-entrainment mask.
d. Decrease the device's input flow to 4 L/min.
ANS: B
A patient is receiving O2 through an air-entrainment device set to deliver 50% O2. The input O2 flow is set to 15 L/min. What is the total output flow of this system?
SOLUTION
Step 1: Compute the air-to-O2 ratio by substituting 50 for the % O2
Step 2: Add the air-to-O2 ratio parts:
1. 7 + 1 = 2.7
Step 3: Multiply the sum of the ratio parts times the O2 input flow:
2. 7 ⋅ 15 L/min = 41 L/min
An air-entrainment device set to deliver 50% O2 that has an input flow of 15 L/min provides a total output flow of approximately 41 L/min.
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