The participants who were chose an opaque envelope containing yellow paper represented the vibration group (Group V). After 1 min of pre-treatment with the vibration device on the intravenous catheter trace, we manually injected 2-2,5 mg/kg, 1% propofol (Propofol 1%, Fresenius 20 ml flacon, Germany) over 15 s. Observer rated the pain responses according to a four-point scale which developed by McCrirrick and Hunterand. Also asked the patients whether they had any discomfort. After the propofol injection, pain scores were observed during propofol injection and 20 seconds after the injection, and hemodynamic records were taken. 0,6 mg/kg rocuronium (Esmeron® 50 mg.5ml-1 N.V. Organon, Oss, Holland) were injected over 10 seconds. The movement response to rocuronium injection pain was evaluated by the same observer on a four-point scale (FPS) during and after 20 seconds rocuronium injection.

The participants who were chose an opaque envelope containing red paper represented the group control (Group C).Only propofol and rocuronium were given to these patients. propofol injection made manually 2-2,5 mg/kg, 1% propofol (Propofol 1%, Fresenius 20 ml flacon, Germany) over 15 s. Patients were observed during and after the injection of propofol for 20 seconds. Observer rated the pain responses according to a four-point scale which developed by McCrirrick and Hunter. During the injection of propofol, we also asked the patients whether they had any discomfort. After the propofol injection for 20 seconds, pain scores were observed, and hemodynamic records were taken. 0,6 mg/kg rocuronium (Esmeron® 50 mg.5ml-1 N.V. Organon, Oss, Holland) were injected over 10 seconds. The movement response to rocuronium injection pain was evaluated by the same observer on a four-point scale (FPS) during and 20 seconds after the rocuronium injection.

The vibration device is a reusable, handheld device with a battery-powered motor and a vibration frequency of approximately 6000 times per minute (Beauty bar facial massaging device, T-Shape Electric Sign Face Massage Tools, Dangshan, China)

Observer rated the pain responses according to a four-point scale. After the injection of propofol to, we also asked the patients whether they had any discomfort.The severity of propofol- injection was evaluated using the following four-point pain response scale developed by McCrirrick and Hunter: level 0: (no pain) no verbal/ facial/ motor reaction to the injection; level 1: (mild pain) a minor verbal/ facial/ motor reaction to the injection but no physical activity or wrist joint movements; and level 2: (moderate pain), pain when asked by the anesthesiologist, or complaint of pain during the injection accompanied by physical activity- facial grimacing or withdrawal of the arm (elbow-shoulder); and level 3: (sever pain), a response accompanied by a facial expression of pain, or a strong vocal response, tears, arm withdrawal, and full body reaction ( including other body movements)

The movement response to rocuronium injection pain was evaluated by the same observer on a four-point scale (FPS). The scale was 0: no movement, 1: movement only the wrist, 2: movement of only the arm (elbow-shoulder) and, 3: general response, movement more than one extremity. 2 minutes after induction, intubation was completed.