Methacholine challenge in young children as evaluated by spirometry and impulse oscillometry.

Background: In young children, it is difficult to obtain a reproducible flow-volume curve throughout all stages of bronchial challenge. The forced oscillation technique (FOT) is especially established in paediatrics because this method does not require forced or maximal manoeuvres and is less cooperation-dependent than conventional spirometry.

Objectives: To evaluate the association of spirometric and impulse oscillometric (IOS) indices in a short protocol for methacholine provocation.

Impulse oscillometry in preschool children and association with body mass index.

Background And Objective: The use of the impulse oscillometry system (IOS) allows differentiated lung function testing with a minimum of cooperation at normal tidal breathing. The aim of this cross-sectional study was to assess the association of body mass (overweight and obese) with oscillometric parameters in preschool children.

Methods: A preschool medical check of 518 children (age 6.