患儿，男，ZI岁，因咳嗽、气促、紫钳、呼吸困难1天，经当地治疗不缓解而转我院，否认异物吸入史、结核接触史，既往无类似病史。体检；＊37．1℃，P140次／分，R60次／分。神萎，时而烦躁，颜面、口唇、甲床紫＄，鼻扇，呼吸急促，呼气延长，三四征明显。气管无移位，双肺叩诊 Children, men, and ZI years of age, due to cough, shortness of breath, purple pliers, and dyspnea for 1 day, were transferred to our hospital after local treatment was not relieved, denied the history of foreign body inhalation, history of tuberculosis exposure, and no previous medical history. Physical examination; *37.1°C, P140 beats/min, R60 beats/min. Shen Wei, sometimes irritated, face, lips, nail violet, nose fan, shortness of breath, expiratory breath, three four signs significantly. Tracheal without displacement, double lung percussion