支气管哮喘是一种支气管反应性增高而表现为可逆性气道阻塞的症候群。测定支气管哮喘患者第１秒用力呼气容积（ＦＥＶ１），用以考察支气管扩张剂对支气管的可逆反应性，是临床上诊断支气管哮喘和判断病情严重程度的一种重要方法。为探索本地区支气管哮喘病人气道反应性明显增高时如何缓解以及缓解的程度。作者用喘乐宁、负氧离子吸入、低流量氧气吸入和休息自然缓解等４种方法对５１３例支气管哮喘患者发作时气道反应性的降低程度进行了对比研究。 Bronchial asthma is a syndrome of increased bronchial reactivity manifested as reversible airway obstruction. Determination of bronchial asthma in patients with forced expiratory volume 1 second (FEV1), bronchodilator to examine the reversibility of bronchial reactivity, is the clinical diagnosis of bronchial asthma and to determine the severity of an important method. To explore the region of bronchial asthma significantly increased airway responsiveness, how to ease and extent of relief. In this study, we compared the reduction of airway responsiveness in 513 bronchial asthma patients with salbutamol, negative oxygen ion inhalation, low-flow oxygen inhalation and spontaneous rest in rest.