目的　观察地塞米松口服治疗急性支气管炎的疗效。方法　采用双盲、随机、安慰剂对照实验 ,70例 2岁以内在急诊室用呼吸疾病评估仪测定 ,其值≥ 6的儿童 ,每个患儿接受 1mg/kg/次的地塞米松或安慰剂口服 ,每小时评估一次共 4h。用呼吸评估变化分数 (RACS)重复测量 ,对结果进行 Objective To observe the efficacy of oral dexamethasone in the treatment of acute bronchitis. METHODS: A double-blind, randomized, placebo-controlled trial of 70 children aged 2 years or younger in the emergency room with a respiratory disease assessor who received ≥ 1 mg / kg of dexamethasone or placebo Oral, hourly assessment of a total of 4h. The results were repeated with the Respiratory Assessment Change Score (RACS) repeated measurements