Patients were allocated randomly using computer-generated randomization into one of four pretreatment groups : a remifentanil group ( 1 g/kg , n = 25 ) , fentanyl group ( 1 g/kg , n = 26 ) , lidocaine 1 % group ( 0.5 mg/kg , n = 25 ) , and normal saline group ( n = 25 ) .