Then midazolam 0.06 mg/kg was administered immediately ; 2 min after aforementioned treatments in each group , all patients received propofol 2 mg/kg ( propofol was mixed with lidocaine 1 mg/ml in Group C ) at an average rate of 0.2 ml per 1 s. Another anesthesiologist , blind to the pretreatment , recorded the occurrence of injection pain using a four-graded pain scale : 1 = no pain ( no reaction to injection ) , 2 = slight pain ( minor verbal/facial response or motor reaction to injection ) , 3 = moderate pain ( clear verbal/facial response or motor reaction to injection ) and 4 = severe pain ( the patient both complained of pain and withdrew the arm ) .