Effects of taVNS Combined With Dexmedetomidine on POVN

Inclusion Criteria: * Women aged 18 to 65; * Elective laparoscopic surgery under general anesthesia; * Classified as American Society of Anesthesiologists (ASA) physical status I to II; * Capable of understanding the study procedures and various assessment scales and able to effectively communicate with the researchers; * Willing to participate in the study and provide written informed consent. Exclusion Criteria: * Patients with ASA anesthesia classification ≥ III; * Poorly controlled hypertension, atrioventricular block ≥ second degree, obesity (BMI \> 30 kg/m²); * Pregnant or breastfeeding; * Known allergy to drugs used in the study protocol, history of traumatic brain injury, history of gastrointestinal surgery; * Liver or kidney dysfunction (liver enzymes or creatinine ≥ 1.5 times the normal value), alcoholism or drug abuse, mental illness, use of antiemetics, opioids, psychoactive drugs, or corticosteroids within 24 hours before surgery; * Patients with implanted stimulators (such as pacemakers, implantable vagus nerve stimulators, deep brain stimulators, spinal cord stimulators, etc.), cochlear implants, or metal implants (except in dental cases); * Skin lesions or dermatological diseases at the site of electrical stimulation; * Preoperative heart rate \< 50 bpm or the presence of sinoatrial node disease or second-degree or higher atrioventricular block; * Patients unable to cooperate with assessments; * Patients participating in other clinical trials.