1, whether the need for incision: no incision, but need to puncture 3-4 needle eyes,, the needle eyes are generally selected thigh, shoulder or neck; 2, whether the need for general anesthesia: most of the local anesthesia can be, the patient is awake, there is no pain, but in the demented, disorganized patients may need general anesthesia; 3, the operation time: generally in young patients, no serious cardiac structural lesions about 2-3 hours.