TY - JOUR T1 - Observational study of inhaled corticosteroid treatment for improved expiratory variability index in steroid-naïve asthmatic children JF - ERJ Open Research JO - erjor DO - 10.1183/23120541.00499-2021 VL - 8 IS - 1 SP - 00499-2021 AU - Janne Burman AU - Pekka Malmberg AU - Ville-Pekka Seppä AU - Tuomas Jartti AU - Sami Remes AU - Ove Mickelsson AU - Anna S. Pelkonen AU - Mika J. Mäkelä Y1 - 2022/01/01 UR - http://openres.ersjournals.com/content/8/1/00499-2021.abstract N2 - The Lancet Asthma Commission calls for objective measurements to support asthma diagnosis, especially for children [1]. The expiratory variability index (EVI) is a novel method of testing lung function that can be measured passively at night with an impedance pneumography (IP) technique using four skin electrodes and a small body-worn recorder. The aim of EVI is to measure variation in flow–volume curve shapes within 15–45% of the expired volume. It has been demonstrated that normal variations in the curve shapes are mainly caused by comparing different sleep cycles [2], which are reduced in the presence of bronchial obstructions [3].Inhaled corticosteroid treatment improves expiratory variability index in steroid-naïve asthmatic children aged 4–7 years https://bit.ly/3n4vBT3 ER -