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Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma

BACKGROUND: Measurement of sputum is used to define airway inflammatory phenotypes. Cough variant asthma (CVA) is considered to be the initial stage of classic asthma (CA). The aim of this study was to describe the association between the different subtypes of CVA and CA. METHODS: A total of 459 pat...

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Autores principales: Gao, Jie, Wu, Feng, Wu, Sifang, Yang, Xing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Dove 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7765682/
https://www.ncbi.nlm.nih.gov/pubmed/33376381
http://dx.doi.org/10.2147/JIR.S269795
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author Gao, Jie
Wu, Feng
Wu, Sifang
Yang, Xing
author_facet Gao, Jie
Wu, Feng
Wu, Sifang
Yang, Xing
author_sort Gao, Jie
collection PubMed
description BACKGROUND: Measurement of sputum is used to define airway inflammatory phenotypes. Cough variant asthma (CVA) is considered to be the initial stage of classic asthma (CA). The aim of this study was to describe the association between the different subtypes of CVA and CA. METHODS: A total of 459 patients with CVA and CA were screened for the study. All included patients performed spirometry, underwent a bronchial challenge with methacholine and induced sputum according to the guidelines. RESULTS: A higher frequency of female patients were found with CVA and the eosinophilic airway inflammation of CVA than in CA and the noneosinophilic airway inflammation of CA (p=0.004 and p=0.024, respectively). Bronchial hyper-responsiveness (BHR) was lower in eosinophilic CVA and CA (p=0.006), while no difference was found in noneosinophilic CVA and CA. Association between the percentage of sputum eosinophils and the FEV(1) level fell below 20% of the baseline value (PD(20)) in CVA and CA (r= −0.1245, p=0.0357 and r= −0.2148, p=0.0014, respectively). CONCLUSION: Eosinophilia may be associated with more severe disease, yet there was no difference in spirometry between the eosinophilic and noneosinophilic groups, and the BHR difference was not dramatic.
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spelling pubmed-77656822020-12-28 Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma Gao, Jie Wu, Feng Wu, Sifang Yang, Xing J Inflamm Res Original Research BACKGROUND: Measurement of sputum is used to define airway inflammatory phenotypes. Cough variant asthma (CVA) is considered to be the initial stage of classic asthma (CA). The aim of this study was to describe the association between the different subtypes of CVA and CA. METHODS: A total of 459 patients with CVA and CA were screened for the study. All included patients performed spirometry, underwent a bronchial challenge with methacholine and induced sputum according to the guidelines. RESULTS: A higher frequency of female patients were found with CVA and the eosinophilic airway inflammation of CVA than in CA and the noneosinophilic airway inflammation of CA (p=0.004 and p=0.024, respectively). Bronchial hyper-responsiveness (BHR) was lower in eosinophilic CVA and CA (p=0.006), while no difference was found in noneosinophilic CVA and CA. Association between the percentage of sputum eosinophils and the FEV(1) level fell below 20% of the baseline value (PD(20)) in CVA and CA (r= −0.1245, p=0.0357 and r= −0.2148, p=0.0014, respectively). CONCLUSION: Eosinophilia may be associated with more severe disease, yet there was no difference in spirometry between the eosinophilic and noneosinophilic groups, and the BHR difference was not dramatic. Dove 2020-12-22 /pmc/articles/PMC7765682/ /pubmed/33376381 http://dx.doi.org/10.2147/JIR.S269795 Text en © 2020 Gao et al. http://creativecommons.org/licenses/by-nc/3.0/ This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License (http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms (https://www.dovepress.com/terms.php).
spellingShingle Original Research
Gao, Jie
Wu, Feng
Wu, Sifang
Yang, Xing
Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma
title Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma
title_full Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma
title_fullStr Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma
title_full_unstemmed Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma
title_short Inflammatory Subtypes in Classic Asthma and Cough Variant Asthma
title_sort inflammatory subtypes in classic asthma and cough variant asthma
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7765682/
https://www.ncbi.nlm.nih.gov/pubmed/33376381
http://dx.doi.org/10.2147/JIR.S269795
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