Abstract: Objective:To explore the incidence,clinical characteristics and related factors of heart failure in critically ill patients.Methods:The heart failure in 477 critically ill patients were evaluated by Doppler echocardiography.The patients with and without heart failure were divided into the heart failure group(group A) and non-heart failure group(group B),respectively.The mean age,sex,basic disease and symptom between two groups were compared and analyzed.Results:Among the critically ill patients,161 cases(33.8%) with heart failure were identified,and the left ventricular ejection fraction in 53.4% patients of group A were more than or equal to 50%.The age in group A was more than that in group B(P<0.01),and the difference of sex between two groups was not statistically significant(P>0.05).Logistic regression analysis of the risk factors showed that the valvular heart disease,coronary heart disease,diabetes mellitus,renal insufficiency and respiratory failure could increase the occurrence of heart failure(P<0.05).Conclusions:During the process of active treating the basic disease,strengthening the monitoring of the relevant risk factors of heart failure,taking the effective intervention measures and reducing the incidence of heart failure can improve the success rate of emergency treatment of critically ill patients.