Effect of electroacupuncture combined with individualized positive end-expiratory pressure on perioperative lung injury serum markers and inflammatory factors in elderly patients undergoing spinal endoscopy

INTERVENTION: Fixed PEEP Group:with a PEEP of 5;Individualized PEEP Group:Individualized PEEP Titrated by Dynamic Compliance (Cdyn);Electroacupuncture Combined with Individualized PEEP Group:Electroacupuncture Combined with Cdyn‐Titrated Individualized PEEP; CONDITION: Lumbar Disc Herniation (LDH) PRIMARY OUTCOME: Soluble Receptor for Advanced Glycation End Products (sRAGE); Pulmonary Surfactant ;Clara Cell Secretory Protein (CC16);interleukin‐6;interleukin‐8;tumor necrosis factor‐alpha; SECONDARY OUTCOME: Oxygenation Inde X(OI);Respiratory Mechanics Parameters;Incidence of Postoperative Pulmonary Complications (PPCs);lung ultrasound score;intraoperative vasoactive agent use; INCLUSION CRITERIA: 1) American Society of Anesthesiologists (ASA) Physical Status Classification II–III; 2) Elderly patients (aged 60–80 years) scheduled for endoscopic spinal surgery under general anesthesia, with an estimated operative time =2 hours; 3) Understand the study content and sign the informed consent form.