Abstract:Objective To observe the effect of opioid-free anesthesia in the sedation of patients with high risk of nausea and vomiting during gastrointestinal endoscopy.Methods This study was a prospective double-blind randomized controlled trial, 182 patients (ASA gradeⅠ or Ⅱ) with high-risk of nausea and vomiting from February 2022 to June 2022 were selected. The patients were assigned to Propofol-surface anesthesia group (group P) and Propofol-Sufentanil group (group S). In group P, saline 0.1 mL/kg was injected intravenously, and then oxybuacaine gel was used for surface anesthesia. After 3 min, Propofol was injected by uniform intravenous titration (injection rate of 4 mg/s) until bispectral index (BIS) < 60, and then endoscopy was performed. In group S, Sufentanil (1.0 μg/mL) 0.1 mL/kg was injected intravenously, and then water soluble lubricants were used for surface lubrication. After 3 min, Propofol was injected intravenously at a constant rate to induce anesthesia until BIS < 60, and then endoscopy was performed. Postoperative nausea and vomiting (PONV) score was used to evaluate the occurrence of PONV in all the patients after operation. The intraoperative and postoperative adverse events, hemodynamic changes, total anesthesia time, stay time in recovery room and Propofol consumption were observed and recorded.Results Compared with group S, the incidence of PONV and postoperative dizziness in group P were decreased, the residence time in the post-anesthesia care unit was short, and the patients’ satisfaction was improved, the differences were statistically significant (P < 0.05).Conclusion Opiate-free anesthesia with Propofol alone is more suitable for sedation in patients with high risk of nausea and vomiting during gastrointestinal endoscopy.