用舒喘灵扩张试验判断支气管哮喘及慢性喘息性支气管炎(慢喘支)患者小气道功能的变化。用最大呼气平均流量(MEFV)曲线测定小气道功能。结果表明,舒喘灵对23例支气管哮喘患者FEF75％、FEF25％～75％、FEF75％～85％有明显的改善作用,而对16例慢喘支患者的各项指标无明显影响,表明支气管哮喘患者的小气道功能异常是可逆的,而慢喘支是不可逆的,同时也表明β_2-受体激动剂对支气管哮喘敏感,而对慢喘支不敏感。 ScuShlin expansion test to determine bronchial asthma and chronic asthmatic bronchitis (slow asthma) patients with small airway function changes. Small airway function was measured using the maximum expiratory mean flow (MEFV) curve. The results showed that Shuchuanling significantly improved the FEF75%, FEF25% ~ 75%, FEF75% ~ 85% in 23 patients with bronchial asthma, while had no significant effect on the indexes of 16 patients with chronic asthma, which indicated that bronchus Small airway dysfunction in patients with asthma is reversible, and chronic asthma is irreversible, but also that beta 2-agonists are sensitive to bronchial asthma, and insensitive to chronic asthma.