支气管哮喘是一种常见病,据国内资料其发病率为0.2—2％左右。由于患者呈阵发性,反复发作的起病,痰中含大量嗜酸性粒细胞等特点,一般认为此病是一种过敏性疾病。随着医学基础学科和临床诊疗手段的发展,对其发病机理的研究正在逐步深入。根据支气管哮喘患者发病原因及其临床的一些表现,可以分外源性(吸入型)哮喘和内源性(感染型)哮喘。而二者由于病情的演变也可发展为混合性哮喘。哮喘其总的 Bronchial asthma is a common disease. According to domestic data, the incidence rate is about 0.2-2%. Because of the paroxysmal appearance of the patient, the onset of recurrent attacks, and the large amount of eosinophils in the sputum, it is generally thought that the disease is an allergic disease. With the development of medical basic disciplines and clinical diagnosis and treatment methods, the research on its pathogenesis is gradually deepening. According to the causes of bronchial asthma and its clinical manifestations, exogenous (inhaled) asthma and endogenous (infectious) asthma can be classified. The two can also develop mixed asthma due to the evolution of the disease. Asthma its total