Objective: To investigate the effect of dexmedetomidine( Dex) on the quality of walke-up test during scoliosis orthopedic surgery. Methods: 26 patients undergoing posterior scoliosis surgery were randomly divided into Dex group and control group. In Dex group,0. 5 μg / kg Dex were infused by pump injection before anesthesia induction followed by continuous pump injection of 0. 2 μg /( kg·h) in surgery while control group received equal volume of normal saline. MAP and HR were observed before anesthesia indu...