１引言近年世界包括我国儿童哮喘发病率上升，尤其是哮喘急性发作就诊率增加，常在夜间或清晨发作加剧。主要症状有喘息、呼吸困难、胸闷或咳嗽，以呼气流量降低为其特征，偶尔可在数分钟内危及生命犤１犦。如采取方便、有效、快捷的治疗方法，能迅速缓解症状。我院儿科于１９ 1 Introduction The world in recent years, including the rising incidence of asthma in children in our country, especially in acute exacerbation of asthma increased, often in the night or early morning seizures intensified. The main symptoms are wheezing, difficulty breathing, chest tightness, or coughing, characterized by reduced expiratory flow, occasionally compromising life in minutes. Such as taking a convenient, effective and efficient treatment, can quickly relieve symptoms. Pediatrics in our hospital at 19