METHODS	Group P0 .5 , group P1 and group P2 received 0.5 , 1 and 2 mg kg ( -1 ) paracetamol respectively ; group L received 0.5 mg kg ( -1 ) lidocaine ; and the control group , group C , received isotonic saline pretreatment in the dorsum of the hand , followed by propofol 1 min later .\