Induction protocol: patients will be given 2 ml normal saline solution, 1 minutes later, 0.3 mg/kg etomidate is injected within 30 to 60 s, and 90 s after the injection of etomidate, 0.2 mg/kg midazolam, 3 μg/kg fentanyl, 0.6 mg/kg rocuronium are given sequently.

Induction protocol: patients will be given 2 ml diluted lidocaine injection in which 20 mg lidocaine is contained, 1 minutes later, 0.3 mg/kg etomidate is injected within 30 to 60 s, and 90 s after the injection of etomidate, 0.2 mg/kg midazolam, 3 μg/kg fentanyl, 0.6 mg/kg rocuronium are given sequently.

Induction protocol: patients will be given 2 ml diluted lidocaine injection in which 30 mg lidocaine is contained, 1 minutes later, 0.3 mg/kg etomidate is injected within 30 to 60 s, and 90 s after the injection of etomidate, 0.2 mg/kg midazolam, 3 μg/kg fentanyl, 0.6 mg/kg rocuronium are given sequently.

Lidocaine injection should be give before the injection of etomidate. In groups L1 and L2, 20 mg and 30 mg lidocaine injection will be diluted to 2ml separately.

myoclonic movements are graded as 0=no myoclonus, 1=mild myoclonus (short movement of a body segment e.g., a finger or a wrist), 2=moderate myoclonus (mild movement of two different muscle groups e.g., face and arm), or 3=severe myoclonus (intense myoclonic movement in two or more muscle groups, fast adduction of a limb)

The intensity of pain was graded using a verbal rating scale. 0-None (negative response to questioning)

1. Mild pain (pain reported only in response to questioning without any behavioral signs)
2. Moderate pain (pain reported in response to questioning and accompanied by a behavioral sign or pain reported spontaneously without questioning)
3. Severe pain (strong vocal response or response accompanied by facial grimacing, arm withdrawl or tears)

Heart rate and mean arterial pressure will be recorded before induction, before the injection of etomidate, 1 minute and 2 minutes after injection of etomidate