The Effects of Remimazolam on the Incidence of Severe Hypoxia During Sedated Hysteroscopy for Assisted Reproduction in Overweight or Obese Patients

Inclusion Criteria: 1. Age between 20 and 50 years. 2. Patients undergoing sedated hysteroscopy for assisted reproduction. 3. ASA classification I-II. 4. BMI ≥ 23 kg/㎡. 5. Patients who have signed an informed consent form. Exclusion Criteria: 1. SpO2 \< 95% in patients inhaling air upon entering the room. 2. Diagnosed with chronic obstructive pulmonary disease (COPD) or currently suffering from other acute and chronic lung diseases requiring long-term or intermittent oxygen therapy. 3. Patients with a history of mental and neurological disorders: such as depression, severe central nervous system depression, Parkinson's disease, basal ganglia disease, schizophrenia, epilepsy, Alzheimer's disease, myasthenia gravis, etc. 4. Patients with severe liver dysfunction. 5. Patients with severe renal insufficiency (requiring dialysis before surgery). 6. Severe heart failure (METS \< 4). 7. History of drug abuse and/or alcohol abuse within the 2 years preceding the screening period (consuming more than three times the standard alcoholic beverages daily, approximately 10g of alcohol, or equivalent to 50g of Chinese alcohol). 8. Allergies or contraindications to benzodiazepines, flumazenil, opiates and their rescue medications, propofol, eggs, or soy products. 9. Breastfeeding women. 10. Patients whom investigator believe are unsuitable for participating in this trial.