Clinical outcomes and inflammatory biomarkers in current smokers and exsmokers with severe asthma

Neil C Thomson, Rekha Chaudhuri, Liam G Heaney, Christine Bucknall, Robert M Niven, Christopher E Brightling, Andrew N Menzies-Gow, Adel H Mansur, Charles McSharry

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

Clinical outcomes are worse in current smokers and exsmokers with mild-to-moderate asthma compared with never smokers, but little is known about the influence of smoking status in patients with severe asthma.

Objectives
We sought to examine the association of current or previous cigarette smoking with clinical and inflammatory variables in patients with severe asthma.

Methods
We compared patients' demographics, disease characteristics, and biomarkers of inflammation in current smokers (n = 69 [9%]), exsmokers (n = 210 [28%]), and never smokers (n = 461 [62%]) with severe asthma (n = 760) recruited to the British Thoracic Society Severe Asthma Registry.

Results
Current smokers had poorer asthma control, more unscheduled health care visits, more rescue courses of oral steroids, and higher anxiety and depression scale scores than exsmokers or never smokers. Current smokers had a reduced proportion of sputum eosinophils compared with never smokers (1% and 4%, respectively) and lower fraction of expired nitric oxide (50 mL/s; 14 ppb and 35 ppb, respectively). Exsmokers compared with never smokers had an increased proportion of sputum neutrophils (59% and 43%, respectively) but a similar proportion of sputum eosinophils (3%) and fraction of expired nitric oxide (50 mL/s; 35 ppb). Both current smokers and exsmokers had reduced serum specific IgE levels to several common environmental allergens.

Conclusion
Current smokers with severe asthma exhibit worse clinical and health care outcomes compared with exsmokers and never smokers with severe asthma. Their inflammatory profiles in sputum and blood differ.
Original languageEnglish
Pages (from-to)1008-16
JournalClinical & Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
Volume131
Issue number4
Early online date16 Feb 2013
DOIs
Publication statusPublished - Apr 2013

Bibliographical note

Copyright © 2013 American Academy of Allergy, Asthma & Immunology. Published by Mosby, Inc. All rights reserved.

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