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气道反应性测定是支气管哮喘的重要特征之一，对评价哮喘的活动性及病情控制情况皆有帮助。常用的诊断方式为逐渐增加吸入药物浓度观察一秒钟用力呼气容积（FEV1），但较贫力费时，而吸入不同药物浓度测定气道阻力变化在国内外已开展，此方法具有方法简单，敏感性高的优点，能
Airway reactivity is one of the most important characteristics of bronchial asthma. It is helpful to evaluate the activity and control of asthma. Commonly used diagnostic methods to gradually increase inhaled drug concentration observed forced expiratory volume one second (FEV1), but less time-consuming, and inhalation of different drug concentrations measured airway resistance changes have been carried out at home and abroad, this method has a simple method, The advantages of high sensitivity, can