remifentanil versus dexmedtomidine for posterior spinal fusion surgery

background: controlling the hemodynamic situation of patients who have spinal operation is of prime importance, and maintaining the heart rate and blood pressure in normal or low- normal levels in these patients can reduce their bleeding loss. one of the commonly used drugs for this purpose is remifentanil. another sedative-hypnotic-analgesic drug, with acceptable effects is dexmedetomidine. the aim of this study was to compare the effect of dexmedetomidine with remifentanil in spinal operation.   methods : in a double blind randomized clinical trial, using random sampling method, 60 patients with the age range of 15-65 years who were candidates for posterior spinal fusion operation were included. induction of anesthesia was performed, and both groups received isoflurane 1% during the surgery. remifentanil was injected via infusion pump in one group. the patients in the trial group received dexmedetomidine. as trial outcomes, heart rate and blood pressure were measured before, after induction and during the operation. pain score, sedation score and the need to analgesic therapy were recorded in the recovery room and the ward. independent sample t-test and chi-square were used for statistical analysis.   results : dexmedetomidine had a significant lowering impact on intraoperative blood pressure and heart rate compared to remifentanil (p< 0.001). the mean of sedation scores after extubation in patients who received dexmedetomidine was significantly higher than the sedation scores in patients who received remifentanil (p< 0.001). the mean of post-extubation and recovery pain score in patients taking remifentanil was significantly higher than patients taking dexmedetomidine (p< 0.05).   conclusion : dexmedetomidine in patients with spinal operation is associated with lower postoperative pain score and intraoperative bleeding. hemodynamic effects are significantly better in patients received dexmedetomidine.