Effect of Acupuncture on Postoperative Nausea and Vomiting

The study will include patients aged 18 years and over, with (American Society of Anesthesiologists) ASA physical status I to II, and scheduled for one or two-level lumbar disc herniation surgery under general anesthesia. Patient characteristics (age, gender, body mass index, etc.) and postoperative nausea and vomiting (PONV) risk factors such as history of PONV, motion sickness, and history of not smoking will be recorded. The primary outcome parameter will be the incidence of PONV within 24 hours postoperatively. The severity of nausea in patients who develop nausea in the postoperative period will be assessed using a Likert scale between 0 and 10. PONV will be defined as vomiting, significant nausea (numerical rating scale \[NRS\] ≥4), and/or need for rescue medication. Patients will be assessed for PONV at 0, 2, 4, 12, and 24 hours using a Likert scale. Emetic attacks, pain and severity of pain, nausea and severity of nausea, need for additional analgesics, and administration of antiemetic rescue medication will be assessed as secondary outcome parameters. The severity of pain and nausea in patients who develop postoperative pain will be assessed using an 11-point numerical rating scale, where '0' indicates the absence of symptoms and '10' indicates the maximum severity. PONV within the first two hours will be defined as 'early', and within 2-24 hours after awakening will be defined as 'late'. Nausea will be defined as the desire to vomit, and vomiting will be defined as the forceful expulsion of stomach contents.