Electroacupuncture Plus 5-HT3 Receptor Inhibitor for PONV Prevention in High-Risk Patients Undergoing Thoracoscopic Lung Cancer Surgery

Inclusion Criteria: * Age ≥ 18 years; * American Society of Anesthesiologists (ASA) physical status I-III; * Body mass index (BMI) 18-30 kg/m²; * Scheduled for elective video-assisted thoracoscopic surgery (VATS) lobectomy, segmentectomy, or wedge resection; * Expected to receive postoperative opioid analgesia, with an Apfel risk score ≥ 3; * Normal pulmonary function, without severe cardiovascular, hepatic, or renal abnormalities; * No infection around the acupuncture sites; * Voluntary written informed consent provided by the subject. Exclusion Criteria: * Severe systemic diseases, such as cardiovascular, hepatic, or renal abnormalities, or poor pulmonary function; * Subjects with cognitive dysfunction or psychological disorders; * History of previous esophageal or gastric surgery; * Hypersensitivity to acupuncture or any study medications; * Severe infection or history of surgery around the acupuncture sites; * Pregnant or lactating women; * Long-term opioid use; * Conversion to open surgery; * Acupuncture treatment received within 1 month prior to enrollment.