A patient with asthma asks the purpose of learning how to use a peak expiratory flow rate (PEFR) device.What is the nurse's best response regarding PEFR?
A) Dilates the bronchi to relieve dyspnea
B) Measures expired air to evaluate ventilation
C) Soothes inflamed bronchi, reducing spasm
D) Liquefies sputum for easier expectoration
Correct Answer:
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