Ján Melter, Katarína Melterová, Jaroslav Fábry, Martina Miškovská, Tatiana Michnová, Peter Bánovčin
Bronchial hyper-reactivity (BHR) is regarded to be the main feature of asthma. The reactivity of bronchial tissue resides in the activation of its immune system in response to inhaled viruses, bacteria, moulds, allergens or chemical substances. A fast elimination of causal agents is the purpose of immunity. Biological substances in the bronchial mucus and activated cells affect formation, progress and regression of bronchial tissue reaction. It seems that the responses of immune system are identical irrespective of the agent. In all cases, eosinophils and mastocytes are activated and after their degranulation, mediators such as MBP, LTB, ECP, PGD, HIS, TR are released. They play the key role in inflammation. The reduction of flow-volume values in FEV1 (-10 %), MEF25 and MEF50 (-18 %), MEF75, PEF and AEX (-15 %) are the most sensitive parameters in revealing BHR at the beginning of its advancement in children. Bronchial hyper-reactivity can be considered as a symptom of asthma if ECP, TR and other mediators are frequently found in bronchial mucus. These findings show the evidence of infiltration of pro-inflammatory cells in bronchial tissue.