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