Asthma
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Obstructive lung disease characterized by episodic wheezing, dyspnea, and cough, that is reversible with bronchodilators. Decreased FEV1, FEV1/FVC, increased TLC, RV, normal DLCO. FEV1 improved >12% and >200 mL with bronchodilators. Typically diagnosed in early childhood to adolescence. Risk factors include childhood eczema, cigarette smoke exposure.