Asthma Clinical Trial
Official title:
Lung Clearance Index in Pediatric Patients With Obstructive Lung Disease
Chronic respiratory diseases (CRDs) affect the airways and other structures of the lungs and
thereby lead to ventilation inhomogeneity. The most common CRDs in children are asthma,
bronchiectasis and cystic fibrosis (CF). All three are obstructive diseases. However, while
asthma is mostly characterized by obstruction due to bronchoconstriction of the airways,
obstruction in bronchiectasis and CF originates primarily from mucus retention due to
abnormal airway clearance mechanisms.
The Nitrogen Multiple Breath Washout test (N2-MBW-test) is a robust and sensitive detector
of early pulmonary changes and ventilation inhomogeneity. The minimal cooperation which is
required for this test makes it very convenient for use in any age category.
Research on LCI described it as a reliable indicator of obstructive lung disease in
pediatric CF patients as from 6 years of age. Whether LCI is a reliable parameter for early
lung disease in asthma children is less clearly demonstrated. No data were found on LCI
calculated from the N2-MBW-test in children with bronchiectasis.
Subjects of all the intervention groups will perform three consecutive nitrogen multiple breath washout tests (N2-MBW-tests) when attending the Universitair Ziekenhuis Brussel (UZB) for their scheduled pulmonology consultation. Only the best measurement (based on LCI result) will be taken into account when comparing the groups. Every subject will be positioned in the same seated position. ;
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