Background: This study aimed to compare the effects of different depths of sedation during propofol anesthesia on postoperative recovery 24 h after knee arthroscopy day surgery in adult patients.Methods: This prospective randomized controlled trial involved 126 patients (ASA physical status 1-2) who were scheduled to undergo arthroscopic day surgery. Patients were randomly divided into two groups: the light-sedation (L-Group) or deep-sedation (D-Group). In the L-group, the bispectral index values were kept in the range of 50-59; in the D-group, the bispectral index values were maintained in the range of 40-49. The Quality of Recovery-15 (QoR-15) score assessed 24 h postoperatively using a 15-item questionnaire was the primary outcome. Secondary outcomes included Athens Insomnia Scale scores, postoperative pain scores, nausea or vomiting.Results: The total QoR-15 score 24 h postoperatively was similar in the two groups (L-group median:130, IQR [127][128][129][130][131][132] vs. D-group median:131, IQR [126][127][128][129][130][131][132][133][134][135], p = 0.089). But among the five dimensions of the QoR-15, physiological comfort was significantly better in the D-group than L-group (p < 0.001). The time to open eyes (p < 0.001), follow the command (p < 0.001) and to extubation (p < 0.001) after surgery in the L-group were shorter than the D-group. The Athens Insomnia Scale scores (p < 0.001) and incidence of dreaming (p = 0.041) at the first postoperative night in the L-group was significantly higher than those in the D-group. Propofol consumption in the L-group was less than D-group (p < 0.001). Conclusion:For patients undergoing arthroscopic day surgery, general anesthesia with high-bispectral-index (50-59) cannot improve the total QoR-15 score 24 h postoperatively after surgery, but can lessen propofol consumption, reduce the time of extubation and anesthesia recovery period, compared with low-bispectralindex (40-49). Patients exposed to general anesthesia with low-bispectral-index values (40-49) may have better quality sleep and physical comfort than those with high-bispectral-index values (50-59).

Objective This study was performed to compare the performance of rotational versus standard insertion of the i-gel® (Intersurgical, Wokingham, Berkshire, England) in patients of advanced age. Methods This single-center, randomized, double-blind trial involved 140 patients of advanced age undergoing general anesthesia. The patients were randomized into the standard group and rotational group. The primary objective of this study was to compare the success rate of the first attempt. The secondary outcome indicators were the insertion time and postoperative complications. Results The placement success rate on the first attempt was significantly higher in the rotational group than in the standard group (92% vs. 73%, respectively). The overall success rate was 100% for the rotational method and 95% for the standard method. The mean ± standard deviation insertion times were similar (15 ± 7.34 vs. 14 ± 7.26 s, respectively). The incidence rates of blood staining of the i-gel®, hoarseness, and sore throat did not increase with the rotational technique and were not significantly different from those of the standard method. Conclusion Compared with the standard method, the rotational method of i-gel® insertion had a higher success rate and did not increase the insertion time and complications in patients of advanced age. Trial registration: This trial was registered at the Chinese Clinical Trial Registry (ChiCTR2000038763, Date of registration: 30/09/2020).