Inflammatory markers and acid-base equilibrium in exhaled breath condensate of stable and unstable asthma patients.

Abstract:

BACKGROUND:Nitrosative and acid stress play an important role in the pathogenesis of asthma. The aim of this study was to evaluate whether, in asthmatics, a link exists between the concentrations of nitrite/nitrate, ammonia and pH values in exhaled breath condensate (EBC) and asthma severity, lung function, exhaled nitric oxide (F(ENO)), total IgE, eosinophil cationic protein (ECP) and blood eosinophilia. METHODS:The above-mentioned parameters were measured in 19 healthy volunteers and 91 allergic asthmatics divided into three groups, i.e. 22 subjects with steroid-naïve stable asthma, 35 with inhaled corticosteroid (ICS)-treated stable asthma and 34 with ICS-treated unstable asthma. RESULTS:Compared with healthy subjects, EBC from asthmatics had significantly lower pH values and ammonia concentrations and significantly higher levels of nitrite/nitrate. The extent of these changes was higher in patients with unstable than in patients with steroid-naïve and stable ICS-treated asthma. The EBC pH was positively correlated with ammonia and negatively correlated with nitrite/nitrate, F(ENO) or blood eosinophilia in all three groups of asthmatics. Significant positive correlations between EBC nitrite/nitrate and blood eosinophilia, ECP levels or F(ENO) were observed in all groups of asthmatics. Significant negative correlations between EBC ammonia and nitrite/nitrate, F(ENO), ECP concentrations or blood eosinophilia were demonstrated in the groups of ICS-naïve and ICS-treated stable asthmatics. CONCLUSIONS:In asthmatic patients there is a relationship between EBC pH, ammonia and nitrite/nitrate concentrations and other recognized markers of airway inflammation. EBC pH values, ammonia and nitrite/nitrate levels measured together may help to assess airway inflammatory status and asthma severity.

authors

Tomasiak-Lozowska MM,Zietkowski Z,Przeslaw K,Tomasiak M,Skiepko R,Bodzenta-Lukaszyk A

doi

10.1159/000335674

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

121-9

issue

2

eissn

1018-2438

issn

1423-0097

pii

000335674

journal_volume

159

pub_type

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