The effects of general anesthesia induction with sevoflurane on the onset of vecuronium

INTERVENTION: Intervention type:DRUG. Intervention1:Induction of general anesthesia with sevoflurane, Dose form:INHALANT, Route of administration:INHALATIONAL, intended dose regimen:5%sevoflurane, 5‐10 min, at the induction of anesthesia. Control intervention1:Induction of general anesthesia with propofol, Dose form:INJECTION, Route of administration:INTRAVENOUS BOLUS, Intended dose regimen:2 mg/kg bolus and continuous infusion at 10 mg/kg/h during induction of anesthesia. CONDITION: Patients who require surgery under general anesthesia PRIMARY OUTCOME: Effects of sevoflurane induction on onset time of vecuronium at corrugator supercilii muscles. Timepoint:During induction of general anesthesia. SECONDARY OUTCOME: Onset time of vecuronium during induction of general anesthesia at corrugator supercilii and adductor pollicis muscles.. Timepoint: During induction of general anesthesia. INCLUSION CRITERIA: ASA1‐2,18‐60 yr old, within 20% of ideal body weight