气道反应注是指气道对各种化学，物理或药物刺激诱发而引起的支气管平滑肌收缩反应的程度。正常人对这些刺激呈无反应状态或仅有轻微反应，而对某些特异敏感者却会引起明显的支气管腔狭窄，即称为支气管高反应性（bronchialhyperresponsiveness，BHR）．气道反应性增高是哮喘的 Airway response note refers to the airway to a variety of chemical, physical or drug-induced bronchial smooth muscle contraction caused by the degree of contraction response. Normal stimulation of these stimuli were non-responsive or only minor reactions, while for some specific sensitive patients will cause significant bronchial stenosis, known as bronchial hyperresponsiveness (BHR). Increased airway reactivity is asthma