目的探讨支气管扩张试验对咳嗽变异性哮喘（CVA）的诊断及鉴别诊断的意义。

Objective To explore the diagnostic and differential significance of Bronchiectasis Test in Coughing Variant Asthma(CVA), and the aim to decrease the misdiagnosis rate.

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结论支气管激发试验及支气管扩张试验在哮喘的诊断中有重要价值，可减少哮喘诊断不足现象；

Conclusion Bronchial provocation test and bronchial dilation test are valuable diagnostic methods which could reduce asthma acatalepsia.

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方法对临床肺功能、支气管扩张试验不能确诊的病人，用乙酰甲胆碱行支气管激发试验，明确诊断。

Methods The mechacholine provocation tests were applied to patients whom couldnt be diagnosed by lung function test and bronchiectasis test.

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