According to the NAEPP guidelines, severe persistent asthma is characterized by lung function test FEV1 ≤ 60%; symptoms of cough, wheezing, chest tightness, or difficulty breathing that are continual; frequent nighttime symptoms; and peak flow with more than 30% variability.
Learn more about asthma classification guidelines.
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Cite this: Zab Mosenifar. Fast Five Quiz: Challenges of Severe Asthma - Medscape - Feb 25, 2021.