患儿,男,3岁,干咳、呼吸急促一个月入院。发病前无诱因,睡眠后呼吸急促减轻。发病以来精神差,乏力、少动、嗜睡,在当地县医院按肺炎治疗无效。体检:体温37℃,呼吸68次,发育营养差,消瘦,面罩吸氧下口唇发绀,轻度鼻扇,杵状指,胸廓无畸形,双肺底部可闻及细湿罗音,心率110次/分,心音有力,无杂音,肝肋下1cm,血红蛋白133g/L,白细胞13.1×10~9/L,中性粒细胞44％, Children, male, 3 years old, dry cough, shortness of breath one month admission. No incentive before onset, rapid breathing after sleep to reduce. Since the onset of mental poor, fatigue, less move, lethargy, pneumonia treatment in the local county hospital invalid. Physical examination: Body temperature 37 ℃, breath 68, development of poor nutrition, weight loss, masks oxygen under the lips cyanosis, mild nose fan, clubbing, thoracic no deformity, the bottom of the lungs can be heard and fine wet rales, heart rate 110 / Min, strong heart sound, no noise, liver ribs 1cm, hemoglobin 133g / L, white blood cells 13.1 × 10 ~ 9 / L, 44% of neutrophils,