title: Lung volume indices of airway obstruction: a suggestion for a new combined index.
mesh_terms: D000402:Airway Obstruction / Q000175:diagnosis*; D000403:Airway Resistance; D001249:Asthma / Q000175:diagnosis; D001991:Bronchitis / Q000175:diagnosis; D006371:Helium; D006801:Humans; D010991:Plethysmography; D012123:Pulmonary Ventilation; D013147:Spirometry; D014797:Vital Capacity
chemical_list: D006371:Helium