1　病例报告患儿男 ,2个月 ,主因气喘、呼吸困难 2d ,加重 1d入院。入院前 2d患儿突然出现气喘、呼吸困难、吃奶哭闹明显 ,不发热 ,无呛咳、声音嘶哑、呕吐、腹泻等。次日上述症状加重 ,伴烦躁不安 ,口唇发绀 ,咳嗽无力 ,哭声弱而入院。否认有异物吸入史。查体 :体温 36 7℃ , 1 case report male patients, 2 months, mainly due to asthma, difficulty breathing 2d, increased 1d admission. 2d before admission, children with sudden asthma, dyspnea, nurse crying obviously, no fever, no cough, hoarseness, vomiting, diarrhea and so on. The next day the above symptoms aggravated, with restlessness, cyanotic lips, weak cough, crying weak and admitted to hospital. Denied history of foreign body aspiration. Physical examination: body temperature 36 7 ℃,