【病例】　男,1岁。入院前2天因着凉轻度咳嗽,次日下午突然喘憋。无呛咳史,异物史不详,先后到两家医院就诊,均怀疑气管异物,入我院。查体:体温38.2℃,呼吸58/min,脉搏168/min。精神萎靡,口周轻度发绀。气管居中,无气管拍击音,两肺散在笛音,少许细小湿罗音,左肺呼吸音稍弱,叩诊 [Case] ​​Male, 1 year old. 2 days before admission because of mild cold cough, sudden wheezing the next afternoon. No choking history, unknown foreign body history, has visited two hospitals, are suspected of tracheal foreign body, into our hospital. Physical examination: body temperature 38.2 ℃, breathing 58 / min, pulse 168 / min. Apathetic, mild cyanosis of the mouth. Tracheal center, no tracheal rattles, lungs scattered flute, a little wet rales, left lung breath sounds weaker, percussion