This study intends to study the optimal dose induced by etomidate in outpatients undergoing painless hysteroscopic surgery. At present, the dosage in the user manual is 0.1-0.3mg/kg. In clinical use, it is found that 0.1mg/kg often fails to achieve sedative effect, and 0.3mg/kg is prone to muscle twitching. Therefore, three groups of doses of 0.15mg/kg, 0.2mg/kg and 0.25mg/kg are set. It is hoped that this study will provide a basis for clinical evaluation of etomidate in anesthesia induction of hysteroscopic surgery.
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Mean Arterial Pressure
Timeframe: Change in Mean Arterial Pressure(MAP) in mm of Hg from baseline value every 5 minutes for 30 minutes
Heart rate per minute
Timeframe: Change in Heart rate per minute from baseline value every five minutes for 30 minutes