Reactance inversion in moderate to severe persistent asthma: low birth weight, prematurity effect, and bronchodilator response.

Introduction: Reactance inversion (RI) has been associated with impaired peripheral airway function in persistent asthma. However, there is little to no data about the difference between asthmatic children with and without RI. This study aimed to detect clinical and lung function differences in moderate-severe asthmatic children with and without RI.

Impulse oscillometry in preschool children with persistent asthma can predict spirometry at school age.

Background: Lung function in children with persistent asthma may be impaired during preschool and school ages. The aim of this study was to describe if some preschool impulse oscillometry (IOS) parameters are related to spirometry alterations on reaching school age.

Methods: In 66 diagnosed with persistent asthma, an IOS was performed at entrance and followed-up to school age where a spirometry was done.

"Reactance inversion" at low frequencies during lung function measurement by impulse oscillometry in children with persistent asthma.

Background: Small airway dysfunction (SAD) in asthma can be measured by impulse oscillometry (IOS). Usually, the reactance should decrease with decreases in frequency oscillation. Sometimes an upward shift of the curve at low frequencies can be observed together with lower than expected reactance values.

Evolutionary lung function evaluated by impulse oscillometry in preschoolers with asthma.

Introduction: Impulse oscillometry (IOS) is useful for measuring lung function in preschool children. Our objec tive was to describe the alterations and evolutionary profile of IOS in asthmatic children under 6 years of age after one year of follow-up.

Patients And Method: 62 preschoolers performed IOS at the begin ning of the study and after one year.