The Feasibility of Different Doses of Etomidate Admixed With Propofol in Induced Abortion: A Randomized, Double Blind Controlled Trial

Inclusion Criteria: * Aged between 20 and 35 years * American Society of Anesthesiology (ASA) Physical Status: Ⅰ or Ⅱ * Singleton pregnancy and the gestational period is 6 to 8 weeks * Expected operation duration is within 60 minutes * The body weight should be within 15% around the standard weight * Signed informed consent form Exclusion Criteria: * Serious cardiac, cerebral, liver, kidney, lung, endocrine disease * Upper respiratory infections within 4 weeks * Long use of hormone or history of adrenal suppression * History of use of glucocorticoids, aprotinin or immunosuppressant * Manifestation of immunodeficiency * History of use of sedatives or opiates * Needs of Neuromuscular blocker (except intubation) * Allergy to trial drug or other contraindication * Pregnant or breast-feeding women * Attended other trial past 30 days