title: FEV1 response to bronchodilation in an adult urban population.
abstract: BACKGROUND
  Most studies evaluating bronchodilation in flow-volume spirometry have been conducted in patients with obstructive airways diseases, but less is known about bronchodilation responses in the general population or in healthy subjects.
  
  
  METHODS
  We evaluated an urban population sample of 628 adults (260 men, 368 women) aged 25 to 74 years with flow-volume spirometry using inhalation of 0.4 mg of a salbutamol aerosol with a spacer device for bronchodilation. On the basis of a structured interview, a subgroup of 219 healthy, asymptomatic nonsmokers was selected.
  
  
  RESULTS
  In the population sample, the average increase in FEV(1) from baseline after salbutamol inhalation was 77.2 mL (SD, 109.7 mL) or 2.5% (SD, 3.9%). In healthy asymptomatic nonsmokers, the mean change in FEV(1) was 62.0 mL (SD, 89.7 mL) or 1.8% (SD, 2.6%). In the whole population, the 95th percentile limit of the increase in FEV(1) was 8.5%, while it was 5.9% among healthy asymptomatic nonsmokers. The absolute change in FEV(1) correlated significantly with baseline FVC (p < 0.01). The FEV(1)/FVC ratio at baseline was the strongest influencing factor for the bronchodilation response.
  
  
  CONCLUSIONS
  The results indicate that a significant increase in FEV(1) from baseline in a bronchodilation test is around 9% in an urban population. The level of the significant absolute increase in FEV(1) seems to depend on FVC. Low baseline FEV(1)/FVC ratio, reflecting airflow limitation, is the strongest determinant for FEV(1) response to bronchodilation.
authors.affiliation: Division of Pulmonary Medicine, Laboratory Department, Helsinki University Central Hospital, Helsinki, Finland.
authors.forename: Annette
authors.initials: A
authors.lastname: Kainu
authors.affiliation: Research Unit of Pulmonary Diseases, Laboratory Department, Helsinki University Central Hospital, Helsinki, Finland.
authors.forename: Ari
authors.initials: A
authors.lastname: Lindqvist
authors.affiliation: Department of Public Health, University of Helsinki, Helsinki, Finland.
authors.forename: Seppo
authors.initials: S
authors.lastname: Sarna
authors.affiliation: Department of Medicine/Respiratory Medicine and Allergology, University of Gothenburg, Gothenburg, Sweden.
authors.forename: Bo
authors.initials: B
authors.lastname: Lundbäck
authors.affiliation: Division of Clinical Physiology and Nuclear Medicine, Laboratory Department, Helsinki University Central Hospital, Helsinki, Finland; Department of Medicine, and the Division of Clinical Physiology and Nuclear Medicine, Laboratory Department, Helsinki University Central Hospital, Helsinki, Finland.
authors.forename: Anssi
authors.initials: A
authors.lastname: Sovijärvi
mesh_terms: D000328:Adult; D000368:Aged; D000420:Albuterol / Q000494:pharmacology*; D049628:Body Size; D001993:Bronchodilator Agents / Q000494:pharmacology*; D015331:Cohort Studies; D005260:Female; D005387:Finland; D005541:Forced Expiratory Volume / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012907:Smoking; D013147:Spirometry; D014504:Urban Health; D014797:Vital Capacity / Q000187:drug effects
chemical_list: D001993:Bronchodilator Agents; D000420:Albuterol