支气管哮喘是一种以发作性细支气管平滑肌痉挛所造成呼气性呼吸困难为特征的疾病,通常分为吸入型(又称外源性)、感染型(又称内源性)和混合型三类。吸入型哮喘是因吸入外界抗原物质所引起,其临床特征有:(1)发病常有季节性,以春秋为主;(2)发病前多有过敏性鼻炎等先兆症状;(3)约半数患者伴有其它过敏性疾病;(4)常在幼年起病,以城市青少年为多;(5)对色甘酸钠有较好的疗效;(6)脱敏治疗常可预防或减轻发作。 Bronchial asthma is a disease characterized by episodic dyspnea caused by seizures of the bronchioloalveolar spasm and is usually classified as inhaled (also known as exogenous), infectious (also called endogenous), and mixed class. Inhaled asthma is caused by the inhalation of external antigens, its clinical features are: (1) the incidence of seasonal, mainly in spring and autumn; (2) before the onset of allergic rhinitis and other aura symptoms; (3) about half Patients with other allergic diseases; (4) often onset in infancy, as urban adolescents; (5) cromolyn sodium has a good effect; (6) desensitization treatment can often prevent or reduce the attack.