Small Airways Response to Bronchodilators in Adults with Asthma or COPD: A Systematic Review

Background: Bronchodilator responsiveness (BDR) is commonly used in the diagnosis of lung disease. Although small airways dysfunction is a feature of asthma and COPD, physiological tests of small airways are not included in guidelines for BDR testing. This systematic review assessed the current evid...

Full description

Saved in:
Bibliographic Details
Published inInternational journal of chronic obstructive pulmonary disease Vol. 16; p. 3065
Main Authors Almeshari, Mohammed A, Alobaidi, Nowaf Y, Sapey, Elizabeth, Usmani, Omar, Stockley, Robert A, Stockley, James A
Format Journal Article
LanguageEnglish
Published Dove Medical Press Limited 30.11.2021
Subjects
Adults
Asthma
Medical research
Medicine, Experimental
Physiological aspects
Respiratory agents
United Kingdom
Online AccessGet full text

Cover

More Information
Summary:Background: Bronchodilator responsiveness (BDR) is commonly used in the diagnosis of lung disease. Although small airways dysfunction is a feature of asthma and COPD, physiological tests of small airways are not included in guidelines for BDR testing. This systematic review assessed the current evidence of BDR using small airways function in asthma and COPD. Methods: The systematic review used standard methodology with the protocol prospectively registered on PROSPERO (CRD42020164140). Electronic medical databases (EMBASE and Medline) were searched using related keywords. s and full texts were screened independently by two reviewers. Studies that reported the change of physiological small airways function and [FEV.sub.1] were included in the review. The revised Cochrane risk of bias tool for RCT and NIH quality assessment tool for cohort and cross-sectional studies were used to evaluate the studies. Results: A total of 934 articles were identified, with 12 meeting the inclusion criteria. Ten studies included asthma patients, 1 study included COPD patients and 1 study included both asthma and COPD. A total of 1104 participants were included, of whom 941 were asthmatic, 64 had COPD and 109 were healthy controls. Studies were heterogeneous in design including the device, dose and time intervals for BDR assessment. A small airway BDR was seen for most tests in asthma and COPD, including oscillometry (R5-20, reactance (X5), area of reactance (AX) and resonant frequency (Fres)) and Maximal Mid Expiratory Flow. Conclusion: There is a measurable BDR in the small airways. However, with no consensus on how to assess BDR, studies were heterogeneous. Further research is needed to inform how BDR should be assessed, its clinical impact and place in routine clinical practice. Keywords: asthma, COPD, bronchodilator, reversibility, small airways function
ISSN:1178-2005
1178-2005
DOI:10.2147/COPD.S3331995