The Effects of Acupoint Electrical Stimulation Combined with Individualized PEEP on Lung Function During Mechanical Ventilation in Elderly Patients Undergoing Spinal Endoscopic Surgery

INTERVENTION: Individualized Positive End‐Expiratory Pressure Group (IPEEP Group):Individualized Positive End‐Expiratory Pressure;Electroacupuncture Combined with Individualized Positive End‐Expiratory Pressure Group (EA+IPEEP Group):Electroacupuncture Combined with Individualized Positive End‐Expiratory Pressure ;Transcutaneous Electrical Acupuncture Stimulation Combined with Individualized Positive End‐Expiratory Pressure Group (TEAS+IPEEP Group):Transcutaneous Electrical Acupuncture Stimulation Combined with Individualized Positive End‐Expiratory Pressure; CONDITION: Lumbar Disc Herniation PRIMARY OUTCOME: Oxygenation Index; SECONDARY OUTCOME: Respiratory Index;Malondialdehyde;Superoxide dismutase;Interleukin‐6;Tumor Necrosis Factor‐alpha;Peak Airway Pressure;Plateau Pressure;Mean Airway Pressure;Lung Compliance;Mean Arterial Pressure;Heart Rate;Hemoglobin;Potential of Hydrogen;Partial Pressure of Carbon Dioxide in Arterial Blood;Duration of Surgery; Fluid Administration Volume; Urine Volume; INCLUSION CRITERIA: (1) Age =60 years old, American Society of Anesthesiologists (ASA) physical status classification II–III; (2) Patients scheduled for endoscopic spinal surgery under general anesthesia; (3) Patients who understand the study content and have signed an informed consent form.