咳嗽变异性哮喘(cough variant asthma,CVA)是指以慢性咳嗽为主要症状或唯一临床表现的一种特殊类型的哮喘,其病理生理改变是持续气道炎症和气道高反应性。其临床表现是:长期顽固性咳嗽,持续时间常大于3周以上,并呈阵发性,在夜间或较强运动后加重。痰量较少,多伴随以下症状:鼻? Cough Variant asthma (CVA) is a specific type of asthma characterized by chronic cough as the primary symptom or the only clinical manifestation. Its pathophysiological changes are persistent airway inflammation and airway hyperresponsiveness. The clinical manifestations are: long-term intractable cough, duration is often greater than 3 weeks and paroxysmal, aggravating at night or after strong exercise. Sputum less, more with the following symptoms: nose?