Lumbar anesthesia is anesthesia that is performed by puncturing from the patient’s lumbar region, usually often choosing the lumbar 3-4 or lumbar 2-3 spinous process space, injecting local anesthetic into the subarachnoid space and causing loss of sensation in the lower body. The indications for lumbar anesthesia are as follows: 1, lower abdominal and pelvic surgery: such as appendectomy, hernia repair, bladder and prostate surgery, uterine and adnexal surgery, etc.; 2, anal and perineal surgery: such as hemorrhoidectomy, anal fistula removal, etc.; 3, lower limb surgery such as fracture or dislocation repositioning, amputation, etc.. Its pain relief effect is more complete than epidural anesthesia, but also to avoid the discomfort of the tourniquet, but the combination of the following diseases patients are contraindications to lumbar anesthesia: 1, central nervous system diseases: especially spinal cord or spinal nerve root lesions, anesthesia may be long-term paralysis of chronic or degenerative lesions of the spinal cord, such as gray matter in the anterior horn of the spinal cord, suspected of high intracranial pressure patients are also correspondingly contraindicated; 2, patients with serious systemic infections: the puncture site If there is inflammation or infection, spinal puncture may bring pathogenic bacteria into the subarachnoid space and cause acute meningitis; 3, patients with hypertension and coronary artery disease; 4, patients in shock due to insufficient blood volume; 5, patients with spinal trauma or a history of severe low back pain; 6, patients with mental illness or severe neurosis who cannot cooperate.