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The respiratory therapist is setting up a portable liquid O2 system for a patient with COPD. The patient is on 2 L/min nasal cannula, and the portable O2 container holds 4 lb of O2. The therapist should explain to the patient that the O2 supply will last for approximately what length of time?

A. 4.5 hours
B. 8 hours
C. 11.5 hours
D. 14 hours

Answer :

Final answer:

Using the patient's flow rate of 2 L/min and the 4 lb oxygen container, the oxygen supply will last for approximately 28.67 hours. None of the provided answers is correct.

Explanation:

The duration of the oxygen supply depends on the patient's flow rate and the amount of oxygen in the container. In this case, the flow rate is 2 liters per minute (L/min) and the container holds 4 pounds of oxygen. The typical liquid oxygen system can provide about 860 liters of oxygen per pound, so a 4-pound container would hold approximately 3,440 liters of oxygen. Therefore, by dividing the total liters of oxygen (3,440 liters) by the flow rate (2 L/min), we get a total of 1720 minutes, or roughly 28.67 hours. None of the options provided (A. 4.5 hours, B. 8 hours, C. 11.5 hours, D. 14 hours) is correct based on this calculation.

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