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目的 Airwayobstructivediseasesasasthma,chronicobstructivepulmonarydisease(COPD)andthelatelydescribedAsthma-COPDOverlapSyndrome(ACOS)representanimportantburdenforpatients,familiessocietyandeconomy.Astheirprevalencesteadilyincreasesinthelastdecadesitisimportanttounderstandtheirpathophysiologythatwillleadustobettertherapeuticoptions.Oneoftheirmaincharacteristicisairwayobstructionwithvariableseverityandpersistency.