Clinical and inflammatory features of asthma with dissociation between fractional exhaled nitric oxide and eosinophils in induced sputum

Astrid Crespo, Jordi Giner, Montserrat Torrejón, Alicia Belda, Eder Mateus, Carmen Granel, Alfons Torrego, David Ramos-Barbón, Vicente Plaza

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)

Abstract

© 2016 Taylor & Francis. Abstract: Background: Measurement of the fractional exhaled nitric oxide (FeNO) and eosinophils in induced sputum are noninvasive markers for assessing airway inflammation in asthma. The clinical usefulness of the correlation between raised FeNO and sputum eosinophilia is controversial. We aimed to examine dissociation between FeNO and sputum eosinophils in a clinical series of asthma patients and to determine whether dissociation between these noninvasive markers was associated with clinical and inflammatory differences in these patients. Methods and findings: A total of 110 patients with asthma were included in a cross-sectional study. All of them were on maintenance treatment for asthma. All patients underwent the following on the same day: FeNO, induced sputum, spirometry, serum total IgE levels and skin prick test. The level of asthma control was determined by the Asthma control Test Questionnaire. In 46 (41.8%) patients, a discrepancy between FeNO and sputum eosinophil count was observed, of those, 34 (73.9%) had a FeNO <50 ppb and high eosinophil count, and were characterized by having a predominance of nonallergic asthma with bronchial eosinophilic inflammatory phenotype. Also, 12 (26.1%) patients had FeNO ≥50 ppb and sputum eosinophilia within the normal reference values, and were characterized by having a predominance of atopy with a paucigranulocytic inflammatory phenotype. Conclusions: A high percentage of patients with dissociation between results of FeNO and sputum eosinophils was observed. These patients showed differential clinical and inflammatory features.
Original languageEnglish
Pages (from-to)459-464
JournalJournal of Asthma
Volume53
Issue number5
DOIs
Publication statusPublished - 27 May 2016

Keywords

  • Asthma
  • asthma phenotype
  • eosinophils
  • exhaled nitric oxide
  • induced sputum

Fingerprint

Dive into the research topics of 'Clinical and inflammatory features of asthma with dissociation between fractional exhaled nitric oxide and eosinophils in induced sputum'. Together they form a unique fingerprint.

Cite this