1.What is hemianesthesia? Using this principle, we inject anesthesia from the back to temporarily block the action of certain spinal nerves, so that we can operate on the area managed by the spinal nerve without the patient feeling pain. In this type of anesthesia, the patient does not lose consciousness, but only the lower half of the body cannot move, so it is called hemianesthesia. 2.Will hemi-anesthesia hurt the spine? Hemianesthesia will not hurt the spine because it is administered through the interspinal space to temporarily block the nerves. 3.What are the possible sequelae of hemi-anesthesia? The possible sequelae of hemi-anesthesia include urinary retention, nerve damage, infection, etc., but they are rare; the most common one is headache after dural puncture (preventable by lying down for 6 hours after anesthesia). 4.Is it easy to have back pain after receiving semi-anesthesia? The incidence of back pain after hemi-anesthesia is the same as that of general anesthesia, and most of them can be resolved spontaneously. The effect of spinal anesthesia usually begins to wear off two hours after anesthesia, and it takes eight hours before all sensation is fully restored. If you can keep lying down for six hours after anesthesia, drink more water after getting up, and slowly get out of bed, you will not have back pain. 7.Can the patient choose the type of anesthesia? After understanding and analyzing the surgical requirements and the patient’s specific situation, the anesthesiologist will choose a suitable anesthesia method and inform the patient and give the necessary explanation. 8.What are the precautions before surgery? Before surgery, patients should first of all release their worries and consult with your doctor about the purpose of surgery, anesthesia, surgical position, various risks and possible discomfort during surgery. You should try to cooperate with the medical staff to make good preparations before surgery, quit smoking and drinking, brush your teeth in the morning and evening, get early treatment if you have oral diseases, and carry out various training required after surgery. If you are taking medication for other diseases before surgery, you must explain to the doctor to clarify whether you need to stop the medication. Before entering the operating room, patients should abstain from drinking and eating for 10 hours (4-8 hours for children), and patients without a urinary catheter should empty the urine. In addition, because the anesthesiologist needs to make preoperative visits, it is best for the patient to stay in the ward the day before surgery and not to go out, and those who have difficulty communicating must be accompanied by family members who are familiar with their condition. 9.Why should I fast before surgery? This is because the operation of surgery and anesthesia and the drugs given during the operation may cause the patient to vomit, and once food and gastric juice are inhaled by mistake, it may lead to respiratory distress or respiratory failure, and complications such as aspiration pneumonia may occur after the operation. Therefore, preoperative fasting is very important, and we hope to draw the attention of patients and their families. 10.Why do I still feel anesthesia? After anesthesia, many patients will ask the anesthesiologist this question. In fact, except for general anesthesia, most of the anesthesia methods do not affect the consciousness, the patient remains awake, and the nerve block area (the anesthetized area) is not devoid of all sensations, the sense of touch, pressure and proprioception still exist, but the sense of temperature and pain have disappeared. Since most patients will be nervous to varying degrees after entering the operating room, the anesthesiologist will usually give appropriate medication to sedate the patient to sleep, so there is no need to worry at all. 11.Does postoperative analgesia affect wound healing? After surgery, the anesthesiologist will use different analgesic methods according to the different conditions of the patient. These analgesic methods will not increase the infection rate of the wound and affect the growth of the incision margin. Effective analgesia can also improve sleep, enhance postoperative immune function, facilitate patients’ coughing and sputum removal and early bedtime activities, thus speeding up postoperative recovery and effectively reducing postoperative complications such as lung infection and lower limb vein embolism. 12.Why is there postoperative chills? Postoperative chills refer to the appearance of involuntary muscle contraction and twitching after surgery, the specific cause of which is still unclear. Local anesthetics, inhaled anesthetic gas, prolonged surgery, large intraoperative blood and fluid transfusion and exposure of the operative field can increase the incidence of chills. Warmth and oxygen can relieve chills, and the doctor will give certain medication if necessary. 13.What about postoperative agitation? Due to the residual effect of drugs, patients after general anesthesia may experience emotional fluctuations and agitation. 14.Does general anesthesia have any effect on intelligence? The general anesthetics used in modern anesthesia are all drugs with minimal effects on the human body and reversible, and can be completely excreted by human metabolism after surgery.