title: Alveolar-arterial PCO2 difference during rebreathing in patients with chronic hypercapnia.
mesh_terms: D000368:Aged; D000402:Airway Obstruction / Q000503:physiopathology; D001991:Bronchitis / Q000503:physiopathology; D002245:Carbon Dioxide / Q000097:blood*; D002908:Chronic Disease; D006801:Humans; D006935:Hypercapnia / Q000503:physiopathology*; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011650:Pulmonary Alveoli / Q000378:metabolism*; D012131:Respiratory Insufficiency / Q000209:etiology
chemical_list: D002245:Carbon Dioxide