Acute and chronic airways disease in children: new bioindicators and molecular targets for therapy

The aim of this thesis was to contribute to the standardization and validation of expiratory flow parameters independent of NO testing, particularly alveolar concentration (CANO) and bronchial NO flux (JawNO) in children and adolescents with allergic respiratory diseases. The thesis was created in the time of increased interest of medicine professionals in non-invasive examination methods and targeted therapeutic influence of inflammation in small airways in asthmatics. After the standardization and validation of clinical benefits, the measurement of concentrations of nitric oxide (FENO) in the air exhaled through the mouth with the speed of 50 ml/s was validated for the evaluation of eosinophilic airway inflammation in patients with asthma and started to be widely used in clinical practice. Currently, there is an ongoing research focused on a new method for FENO measurement at several flow rates, which uses physiological models of NO transfer in exhaled air, allowing to quantify the amount of NO in an indirect way and to monitor the intensity of the inflammatory processes in distal and proximal airways non- invasively. In groups of children and adolescents with allergic rhinitis and / or bronchial asthma and their healthy peers (aged 6 -19 years), the concentration of FENO was examined using online..