患儿，男，9个月时因受凉后咳嗽、气促1周入院。查体：体温正常，口周及指、趾末端发绀，呼吸三凹征阳性，双肺呼吸音粗糙，可闻及细湿罗音，心率130次／min，律齐，心音有力，未闻及瓣膜杂音，肝脾无异常，初诊为支气管肺炎，经治疗无效。血WBC 13×109／L，以中性粒细胞为主 Children, male, 9 months due to cold and cough, shortness of breath 1 week admission. Physical examination: normal body temperature, perioral and fingers, cyanotic end of the toe, three signs of respiratory positive, lung breath sounds rough, can be heard and fine wet rales, heart rate 130 beats / min, law Qi, heart sound, Valve noise, no abnormal liver and spleen, newly diagnosed as bronchial pneumonia, the treatment is invalid. Blood WBC 13 × 109 / L, mainly to neutrophils