title: Reversibility of airways obstruction in emphysema.
mesh_terms: D000402:Airway Obstruction / Q000150:complications*; D000403:Airway Resistance; D006801:Humans; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D011656:Pulmonary Emphysema / Q000150:complications*; D012129:Respiratory Function Tests; D013147:Spirometry
chemical_list: D010100:Oxygen