tokens: Group PS , the control group , received normal saline and succinylcholine 1 . 5 mg x kg ( - 1 ) ; Group LS , lidocaine 1 . 5 mg x kg ( - 1 ) and succinylcholine 1 . 5 mg x kg ( - 1 ) ; Group PR , normal saline and rocuronium 0 . 6 mg x kg ( - 1 ) .