title: Elevated concentrations of exhaled hydrogen peroxide in asthmatic patients.
abstract: BACKGROUND
  Airway inflammation is important in the development and progression of asthma. Activation of inflammatory cells induces a respiratory burst resulting in the production of reactive oxygen species, such as H(2)O(2). The aim of this study was to measure the concentration of H(2)O(2) in exhaled breath condensate and its correlation with airway obstruction, airway hyperresponsiveness, and concentration of eosinophil cationic protein (ECP) in serum in 70 steroid-naive, atopic patients with unstable asthma (20 men; age range, 18 to 62 years) and 17 normal subjects (7 men; age range, 19 to 34 years).
  
  
  METHODS
  Exhaled H(2)O(2) was measured using a colorimetric assay, and the concentration of ECP in serum was measured using radioimmunoassay. Airway hyperresponsiveness was expressed as the provocative concentration of inhaled histamine causing a 20% fall in FEV(1) (PC(20)).
  
  
  RESULTS
  In patients with asthma, the mean H(2)O(2) concentration was significantly elevated compared to values in normal subjects: 0.127 +/- 0.083 mol/L vs 0.024 +/- 0.016 mol/L (p < 0.001). There was a significant correlation among H(2)O(2) concentration, FEV(1), PC(20), and ECP in serum.
  
  
  CONCLUSIONS
  We conclude that exhaled H(2)O(2) is significantly elevated in asthmatic patients. This is correlated with disease severity and indirect markers of airway inflammation. Measurement of exhaled H(2)O(2) may be useful to assess airway inflammation and oxidative stress in asthmatic patients.
authors.affiliation: Hospital Therapeutic Clinic, Pavlov Medical University, St. Petersburg, Russia. emelav@netscape.net
authors.forename: A
authors.initials: A
authors.lastname: Emelyanov
authors.forename: G
authors.initials: G
authors.lastname: Fedoseev
authors.forename: A
authors.initials: A
authors.lastname: Abulimity
authors.forename: K
authors.initials: K
authors.lastname: Rudinski
authors.forename: A
authors.initials: A
authors.lastname: Fedoulov
authors.forename: A
authors.initials: A
authors.lastname: Karabanov
authors.forename: P J
authors.initials: PJ
authors.lastname: Barnes
mesh_terms: D000293:Adolescent; D000328:Adult; D000402:Airway Obstruction / Q000175:diagnosis / Q000503:physiopathology; D001249:Asthma / Q000175:diagnosis* / Q000503:physiopathology; D001798:Blood Proteins / Q000502:physiology; D001944:Breath Tests; D016535:Bronchial Hyperreactivity / Q000175:diagnosis / Q000503:physiopathology; D001985:Bronchial Provocation Tests; D047091:Eosinophil Granule Proteins; D005260:Female; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D006861:Hydrogen Peroxide / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D012260:Ribonucleases; D012307:Risk Factors
chemical_list: D001798:Blood Proteins; D047091:Eosinophil Granule Proteins; D006861:Hydrogen Peroxide; D012260:Ribonucleases