SICU and ICU both belong to the category of ICU, ICU is called intensive care unit, SICU is the intensive care unit of the surgical system, the difference between the two is as follows: 1. SICU: mainly for surgical patients, especially surgical patients, critically ill patients live in a relatively short period of time, generally after the surgery, 1-2 days immediately can be transferred out of the ICU, but the condition of these patients are changing. Especially for post-operative cardiac surgery patients, we need to pay great attention to monitoring, including post-operative bleeding, when they arrive at the cardiac surgery SICU. Because postoperative patients are most afraid of bleeding and low blood pressure, it is necessary to strengthen monitoring and take appropriate treatment measures at the first time, so as to minimize and reduce the time of ICU for postoperative surgical patients; 2, ICU: usually a comprehensive ICU, which can admit both internal medicine and surgery, but may admit more patients from internal medicine. But ICU or medical patients may take longer, especially for end-stage, serious diseases, COPD treatment of pulmonary infections takes longer, and in the middle may repeatedly appear a variety of changes in the condition, and even the last may not be transferred out of the ICU. ICU, and may require long-term stay in ICU for resuscitation treatment.