目的探讨咳嗽变异型哮喘（CVA）肺功能气道弹性阻力和肺泡灌洗液（BALF）细胞学以及细胞因子变化的特征。

Objective To study the characteristics of airway elastic resistance and changes of cytologicals, cytokines in bronchoalveolar lavage fluid (BALF) in patients with cough variant asthma (CVA).

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其机制主要是呼吸中枢的功能降低，肺和胸廓的弹性阻力、呼吸道的非弹性阻力增加所致。

The falling function of the respiratory centre, the elastic resistance of the lungs and thoracic cage, and the non-elastic resistance in the respiratory tract are responsible for the decline.

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