呼吸机相关性肺炎(VAP)是指机械通气(MV)后出现的肺部感染,属难治性肺炎,目前尚缺乏快速理想的病原学诊断方法,治疗主要依赖于经验用药。1诊断标准1.1插管48h后发热、脓性痰或气管、支气管分泌物涂片染色可见细菌。1.2外周血白细胞总数升高大于10×109/L或较原先增加25%。1.3肺泡动脉氧分压差升高。1.4X线胸片提示肺部出现新的或进展中的侵润病灶。1.5气管吸出物定量培养阳性,菌落计数大于106/ml,若痰培养作为细菌学检验标本,则必须低倍镜视野下白细胞大于 Ventilator-associated pneumonia (VAP) is a lung infection that occurs after mechanical ventilation (MV). It is a refractory pneumonia. There is a lack of rapid and ideal etiological diagnosis. The treatment mainly depends on experience medication. 1 diagnostic criteria 1.1 intubation fever after 48h, purulent sputum or tracheal, bronchial smear staining bacteria can be seen. 1.2 The total number of peripheral leukocytes increased more than 10 × 109 / L or 25% increase over the original. 1.3 alveolar artery oxygen partial pressure increased. 1.4X chest radiograph suggests a new or progressive invasion of the lungs in the lungs. 1.5 Tracheal aspirate quantitative culture positive colony count greater than 106 / ml, if the sputum culture as a bacteriological test specimen, you must low magnification field of view white blood cells greater than