In many people's eyes, anesthesiologist is a matter of injection, but in fact, it is far from that simple. In the industry, there is a saying that "surgeons treat diseases, anesthesiologists protect their lives", and anesthesiologists are also known as "the protection god of life under the shadowless lamp". So, how to understand the role of anesthesiologists? What should patients pay attention to before anesthesia? With the development of medical technology, anesthesia has developed from simple operation room anesthesia to perioperative management, including preoperative visit, postoperative analgesia, etc. on the day before operation, anesthesiologists will visit patients in the ward before operation. The preoperative visit is mainly to understand the patient's information, assess the patient's health status, such as the patient's past history, drug allergy history, family history, whether there are any diseases, etc., and then according to the evaluation results, formulate the anesthesia scheme. On the day of operation, anesthesiologists should not only check the basic information of patients and prepare narcotic drugs, but also prepare equipment and monitoring. For complex surgery, anesthesiologists should monitor nearly 100 kinds of indicators, such as ECG, blood pressure, oxygen saturation, and so on. Through these indicators, we can judge the current status of surgical patients and provide safety guarantee for surgeons. If an emergency occurs during the operation, including cardiac arrest, massive blood loss, myocardial infarction, anaphylactic shock, the anesthesiologist will immediately organize rescue to avoid the occurrence of adverse conditions. After the operation, the anesthesiologist will stop the drug and recover the patient smoothly. In a word, anesthesia is like flying an airplane. It is necessary to ensure both takeoff and landing