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Influence of cigarette smoking on airway inflammation and inhaled corticosteroid treatment in patients with asthma

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Background:

Cigarette smoking induces neutrophilic airway inflammation and relative resistance to inhaled corticosteroids (ICS).

Objective:

We evaluated the influence of cigarette smoking on airway inflammation in patients with asthma and also compared the effect of ICS between smoking and nonsmoking in patients with asthma.

Methods:

Smokers with asthma (n = 81) and nonsmokers with asthma (n = 52) were recruited for the study. We examined lung function, fractional exhaled nitric oxide (FeNO) concentration, induced sputum, and acetylcholine inhalation before and 6 months after inhaling budesonide at 800 μg/day. Thirty-four healthy volunteers were included as controls.

Results:

Smokers with asthma showed a lower forced expiratory volume in 1 second (FEV1) to forced volume capacity (FVC) ratio (p < 0.05), a lower FeNO (p < 0.01), a lower eosinophil proportion (p < 0.05), and a higher neutrophil proportion (p < 0.05) in induced sputum than nonsmokers with asthma. Bronchial hyperresponsiveness (the provocative concentration of acetylcholine [Ach] that produced a 20% fall in FEV1 [PC20-Ach]) was increased in smokers with asthma compared with nonsmokers with asthma (p < 0.05). Both smokers with asthma and nonsmokers with asthma exhibited more prominent airway obstruction, a higher FeNO, and a higher percentage of sputum eosinophils than the controls (p < 0.05 to p < 0.001, each). After 6 months of treatment with inhaled budesonide at 800 μg/day, the improvement in lung function (FEV1 to FVC ratio, flow at 50% forced vital capacity [V50% predicted] and flow at 25% forced vital capacity [V25% predicted]), the eosinophil proportion in induced sputum and PC20-Ach were lower in smokers with asthma than nonsmokers with asthma (p < 0.05).

Conclusion:

Smokers with asthma showed neutrophilic airway inflammation in addition to eosinophilic inflammation, and cigarette smoking impaired the efficacy of ICS treatment in mild-to-moderate asthma. These findings have important implications for the management of patients with asthma and who smoke.
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Keywords: Airway hyperresponsiveness; airway inflammation; airway obstruction; bronchial asthma; fractional exhaled nitric oxide; induced sputum; inhaled corticosteroid; lung function; neutrophilic; smoking

Document Type: Research Article

Affiliations: Clinical Research Center, Fukuoka National Hospital, Fukuoka, Japan

Publication date: July 1, 2016

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma and by having the potential to directly impact the quality of patient care. AAP welcomes the submission of original works including peer-reviewed original research and clinical trial results. Additionally, as the official journal of the Eastern Allergy Conference (EAC), AAP will publish content from EAC poster sessions as well as review articles derived from EAC lectures.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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