Abstract: Objective To investigate the clinical application and nursing care of impedance cardiography (ICG)monitoring in the diagnosis and treatment of critically ill patients.Methods A total of 60 critically ill patients were divided into 2 groups according to whether to use ICG monitor-ing or not:ICG group and control group,30 cases in each.ICG group was given the new ICU tech-nology to monitor cardiac function while control group was performed with SWAN-GANZ moni-toring without ICG.Results Compared with control group,all the indexes of ICG monitoring in ICG group were significantly improved after 72 h treatment,and acute physiology and chronic health evaluation (APACHE II),the incidence of pulmonary edema,ICU stay,the time of auxil-iary mechanical ventilation time were significantly reduced (P <0.01,or P <0.05),but the mor-tality of 2 groups was no statistically significant difference (P >0.05).Conclusion Application of ICU monitoring technology can provide reliable cardiac function monitoring indexes for the diagnosis and treatment of critically ill patients and make the doctors and nurses to master the hemodynamics status of patients at any time,and based on this,nursing care is a guarantee for the smooth applica-tion of ICG monitoring technology.