Objective To investigate the preventive effect of rapid preoxygenation technique on hypoxia caused by respiratory depression during outpatient obstetrics-gynecology operations. Methods According to a computer-generated random sequence, a total of 120 ASA I-II patients undergoing outpatient obstetrics-gynecology operations were randomly allocated into the trial group or the control group, 60 in each group. Patients in the control group received preoxygenation with tidal volume breathing. Patients in the trial group received preoxygenation with eight deep breaths (DB) in 1 min before anesthesia. All patients were induced with midazolam 1 mg, fentanyl 1μg /kg and propofol 2 mg/kg, and were maintained with propofol when needed. The following parameters were observed, including the incidences of respiratory depression and apnea, the onset time of anesthesia, the total doses of propofol as well as the changes in PetCO2 and SpO2. Results No significant differences were observed in demographic characteristics, the onset time of anesthesia, the total doses of propofol, and the incidences of respiratory depression and apnea between the two groups (P gt;0.05). However, the SpO2 in the control group was decreased significantly with a higher incidence of hypoxia (Plt;0.05). Conclusions Rapid preoxygenation technique may increase the oxygen reserves and improve the tolerance to hypoxia. It is effective in avoiding hypoxia caused by respiratory depression and apnea during outpatient obstetrics-gynecology operations.
Objective To investigate the safety and feasibility of hysteroscopic treatment for retained products of conception (RPOC) combined with enhanced myometrial vascularity (EMV) in ambulatory surgery mode. Methods A retrospective analysis was conducted on the clinical data of patients who underwent hysteroscopic treatment for RPOC combined with EMV in ambulatory surgery mode at West China Second University Hospital between May 2021 and May 2024, including their basic information and surgical related conditions. Results A total of 54 patients were included, with an average age of (33.37±4.54) years and an average number of pregnancies of 3.14±1.56. The preoperative blood level of human chorionic gonadotropin was 11.45 (5.00, 82.96) mU/mL. Color Doppler ultrasound showed an average size of pregnancy residue (2.47±0.77) cm. The average peak systolic velocity was (55.13±18.55) cm/s. The intraoperative blood loss was 17.63 (1.00, 300.00) mL. The average surgical time was (30.07±20.64) minutes. The hospital stay was 0.69 (0.50, 1.00) days. There was 1 case of postoperative complications (incidence rate 1.9%), which had the second hysteroscopy to remove retained pregnancy tissue one month after the first surgery due to RPOC. There were 6 cases of postoperative re pregnancy. Conclusion Hysteroscopic treatment for RPOC combined with EMV in ambulatory surgery mode is safe and feasible, and is worth promoting.