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The aim The aim of the research was to analyze the results of observation andexamination of COPD patients in order to identify a group of individualswith potentialasthma overlap. Materials and methodsWe have conducted a two-stagedynamic investigation of 43 COPD patients during 3-8 years. The patients were divided into two groups group 1 counted 30 individuals who presented with at least one episode of reversible bronchial obstruction (RBO) during the observation; group 2 - 13 individuals who presented with nonreversible bronchial obstruc