摘要Varieties of critical scenarios,such as hypotension,hypoxemia,dyspnea,cardiac arrest,and acute kidney injury (AKI),which affect multiple organs,are always encountered in critically ill patients.Recently,with the noninvasive,convenient,and unique value of quick diagnosis and dynamic monitoring during the course of treatment,critical ultrasonography has been widely used in critical care medicine,which makes the bedside and real-time evaluation practical.[1] As an important part of critical ultrasonography,critical care echocardiography (CCE) can provide information about the circulatory system from two aspects of morphology and function,which can be an effective tool to save lives in critically ill patients with hemodynamic instability.CCE can quickly identify potential causes of shock and provide definitive information to physicians to choose the correct treatment strategy.[2-5] Therefore,CCE has become a milestone in the hemodynamic monitoring of critically ill patients.In this article,we summarize the following ten principles of CCE,which may be helpful in clinical applications.