Effect of Acupoint Electrical Stimulation on Incidence of Hypotension After Spinal Anesthesia

This study is intended to include elderly patients who are selected to undergo lower limb and pelvic orthopedic surgery under spinal anesthesia. Through prospective, randomized and controlled clinical trials, the investigators will observe the effect of this treatment on the incidence of hypotension in elderly patients after spinal anesthesia through TEAS points Neiguan and Quchi before or during surgery, and further explore its related mechanisms.

Inclusion Criteria:90>65, regardless of gender;ASA classification I-III; ③ Orthopedic surgery was performed under spinal anesthesia; ④ Sign the informed consent form.Exclusion Criteria:Uncontrolled hypertension;Arrhythmia or myocardial ischemia;Severe cardiopulmonary insufficiency;HB<100g/L;Severe dehydration; ⑥ There are contraindications to spinal anesthesia; ⑦ Allergies to local anesthetics;Communication barriers; ⑨ Refusing to sign the informed consent form.