- National Heart, Lung, and Blood Institute; National Institutes of Health (NHLBI/NIH) (1991) defines asthma as a:
- Lung disease with the following characteristics:
- Airway obstruction that is reversible (but not completely so in some patients) either spontaneously or with treatment
- Airway inflammation
- Increased airway responsiveness to a variety of stimuli. [7]
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