This observational study aims to compare responses to different, commonly used inhaled bronchodilators in children born preterm with bronchial obstruction at spirometry. All children were diagnosed with Chronic Lung Disease of Immaturity (CLDI). The main questions are: * Is any inhaled bronchodilator or their combination generally superior in children with CLDI when assessing the reversibility of bronchial obstruction? * Is there an individual difference in the effect of betamimetic, anticholinergic or their combination between children with CLDI? Participants will: * Come to our clinic in a stable state without acute infection and they will be randomly assigned to the first inhaled bronchodilator. * They will then perform a spirometry test before and after the inhalation of the drug. * This visit will repeat 3 times, each with a different bronchodilator (beta2agonist, anticholinergic and their combination).
Age range
5 Years – 18 Years
Sex
ALL
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Change of spirometric parameters of bronchial obstruction in children born preterm to inhaled salbutamol, ipratropium bromide and combination of fenoterol with ipratropium bromide
Timeframe: baseline and post-interventional spirometry after 15-30 minutes (interval specific to bronchodilator) during three check-ups with min. time interval between check-ups 24 hours and max. 30 days
Change of spirometric parameters of lung volume in children born preterm to inhaled salbutamol, ipratropium bromide and combination of fenoterol with ipratropium bromide
Timeframe: baseline and post-interventional spirometry after 15-30 minutes (interval specific to bronchodilator) during three check-ups with min. time interval between check-ups 24 hours and max. 30 days
Change of area under the flow-volume spirometric curve in children born preterm to inhaled salbutamol, ipratropium bromide and combination of fenoterol with ipratropium bromide
Timeframe: baseline and post-interventional spirometry after 15-30 minutes (interval specific to bronchodilator) during three check-ups with min. time interval between check-ups 24 hours and max. 30 days