呼吸机相关性肺炎(ventilator associated pneumonia,VAP)指开始机械通气48 h后出现的肺实质感染,是患者在气管插管时不存在肺炎,也无潜在肺炎,而在机械通气后发生的一种医源性细菌性肺炎。根据患病人群不同,VAP的患病率为6%~52%,病死率可达50%,其本身治疗困难,也使原发病的治 Ventilator-associated pneumonia (VAP) refers to pulmonary parenchymal infection that occurs 48 hours after the onset of mechanical ventilation and is the absence of pneumonitis and underlying pneumonia in patients with endotracheal intubation, a condition that occurs after mechanical ventilation Iatrogenic bacterial pneumonia. According to the prevalence of different groups, the prevalence of VAP is 6% to 52%, the mortality rate of up to 50%, its own treatment is difficult, but also the treatment of primary disease