PT - JOURNAL ARTICLE AU - Wytse B. van den Bosch AU - Alan L. James AU - Harm A.W.M. Tiddens TI - Structure and function of small airways in asthma patients revisited AID - 10.1183/16000617.0186-2020 DP - 2021 Mar 31 TA - European Respiratory Review PG - 200186 VI - 30 IP - 159 4099 - http://err.ersjournals.com/content/30/159/200186.short 4100 - http://err.ersjournals.com/content/30/159/200186.full SO - EUROPEAN RESPIRATORY REVIEW2021 Mar 31; 30 AB - Small airways (<2 mm in diameter) are probably involved across almost all asthma severities and they show proportionally more structural and functional abnormalities with increasing asthma severity. The structural and functional alterations of the epithelium, extracellular matrix and airway smooth muscle in small airways of people with asthma have been described over many years using in vitro studies, animal models or imaging and modelling methods. The purpose of this review was to provide an overview of these observations and to outline several potential pathophysiological mechanisms regarding the role of small airways in asthma.Small in size, big in impact: structural and functional alterations of the epithelium, extracellular matrix and airway smooth muscle are present in the small airways of asthma patients. These alterations may play a pivotal role in asthma pathophysiology. https://bit.ly/3lIlT62