40例老年重症肺炎并发多器官功能衰竭（MOF）相关因素主要为：病程长，基础病严重，重要脏器功能状态差；衰竭器官数与缺氧程度是正相关，衰竭器官数与病死率呈正相关。 40 cases of elderly patients with severe pneumonia complicated with multiple organ failure (MOF) related factors are: long duration, severe basal disease, poor functioning of vital organs; failure of organs and hypoxia is a positive correlation between the number of organ failure and mortality was positively correlated .