title: Early detection of airways obstruction by the closing volume technique.
mesh_terms: D000402:Airway Obstruction / Q000175:diagnosis* / Q000503:physiopathology; D001128:Argon; D005260:Female; D006371:Helium; D006801:Humans; D008168:Lung / Q000503:physiopathology; D008297:Male; D008722:Methods; D009584:Nitrogen; D011650:Pulmonary Alveoli / Q000502:physiology; D012907:Smoking / Q000150:complications; D013147:Spirometry / Q000295:instrumentation; D014797:Vital Capacity; D014978:Xenon
chemical_list: D006371:Helium; D014978:Xenon; D001128:Argon; D009584:Nitrogen