1. Fasting for at least 8-12 hours and drinking for 3 hours before anesthesia. Du Zhengguang, Department of Spleen and Gastroenterology, Beijing Hospital of Traditional Chinese Medicine 2. Patients undergoing painless endoscopy and treatment are required to undergo screening for infectious diseases and electrocardiogram before the examination. 3. For the safety of the patient, the patient and/or family should communicate with the anesthesiologist in person before anesthesia so that the anesthesiologist can try to fully understand the patient’s medical history and then have the right to decide whether to administer anesthesia according to the patient’s physical status. 4. If the patient conceals his or her condition (such as heart disease, lung disease, vomiting history, etc.) and the actual situation, the consequences are serious and may endanger the patient’s life and affect resuscitation.5. The whole process of patient’s anesthesia and examination → awakening → fully awake → leaving the hospital takes about 30-40 minutes, during the whole process, please ask the patient to cooperate with the anesthesiologist’s arrangement to prevent accidents such as accidental fall.6. Discharge criteria: patient is conscious, vital 7. On the day of painless gastroscopy, please do not drive a car, ride an electric bicycle, work at height or do fine work, etc. It is better not to drink alcohol. 8. When the patient is under anesthesia → examination → wake up, family members please wait in the waiting area, the anesthesiologist and nurses will take good care of you. The doctor will contact you at your convenience to explain the status of the examination and your condition. 9. Patients may have the illusion that they have not yet been examined because they have little or no memory of the examination process. It is also important to note that some women love beauty and wear nail polish. It is recommended that you do not wear nail polish, especially colored nail polish, on at least both index fingers, which will affect the accuracy of the instrument during the test. 12. Do not wear lipstick, which will affect the anesthesiologist’s judgment of whether you are hypoxic and the degree of hypoxia.