Which of the following statements are true about low-flow O2 delivery systems?
1. The greater the patient's inspiratory flow, the greater is the FiO2.
2. All low-flow devices provide variable O2 concentrations.
3. The O2 provided by a low-flow device is diluted with air.
4. The patient's flow usually exceeds that from a low-flow device.
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: D
In this case, the more the patient breathes, the more air dilutes the delivered O2, and the lower is the FiO2. Hence, there is an inverse or opposite relationship between FiO2 and inspiratory flow with such O2 devices.
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