Geneva, April 20 -- International Clinical Trials Registry received information related to the study (ChiCTR2600121808) titled 'The effective dose for successful insertion of a laryngeal mask and impact on discharge time of alfentanil combined with remimazolam besylate in ambulatory hysteroscopic surgery:a prospective,randomized,controlled clinical trial' on April 3.

Study Type: Interventional study

Study Design: Parallel

Primary Sponsor: Guabgzhou First People's Hospital

Condition: Endometrial polyps

Intervention: Trial 1:Alfentanil group (Group A) Modified Dixon sequential method: After 3 minutes of preoxygenation, remimazolam besylate 0.2 mg/kg was slowly administered intravenously over 60 seconds, followed by alfentanil intrav...