为使咳型哮喘病人得到及时诊断与治疗，我院肺功能室采取超声雾化蒸馏水吸入激发试验的方法，对门诊或住院干咳两周以上经抗菌素及止咳化痰药物治疗无效者，受检对象３２例。结果发现病程２～４周１０例，２例阳性；５～８周１３例，５例阳性；＞８周９例，７例阳性。认为临床上干咳或伴胸闷患者，病程达两周左右就应给予进行蒸馏水激发试验。 To make timely diagnosis and treatment of cough-type asthmatic patients, our hospital pulmonary function room to take ultrasonic atomized distilled water inhalation challenge test methods, outpatient or hospitalized cough more than two weeks by antibiotics and cough and phlegm drugs were ineffective, the subjects 32 cases. The results showed that the duration of 2 to 4 weeks in 10 cases, 2 cases were positive; 5 to 8 weeks in 13 cases, 5 cases were positive;> 8 weeks in 9 cases, 7 cases were positive. That clinical cough or chest tightness in patients with disease duration of about two weeks should be given distilled water challenge test.