A patient's DPI dose counter still shows doses remaining, but the patient feels no therapeutic effect after inhalation. What is the MOST likely explanation?
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A
The medication has chemically expired inside the device
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B
The patient is not generating sufficient inspiratory flow to aerosolize the powder
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C
The DPI has been stored improperly in a high-humidity environment
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D
Both B and C are plausible causes that an educator should investigate