Methods: Between August 2008 and May 2009, consecutive 100 patients who underwent CABG surgery in our clinic were included in this double-blind and placebo-controlled study. Patients were randomized to either dexmedetomidine infusion or placebo. The sedation level of the patients was regulated using Ramsey Sedation Scale. Permuted blocks of four method was used to randomize patients.

Results: A total of 86 patients were included in the analysis including 49 in the dexmedetomidine group and 37 in the placebo group. There was no statistically significant difference in major intraoperative and postoperative variables between the groups. Postoperative day 1 creatinine clearances values above cut-off point of 110 μg/day were significantly different between the groups. These changes were not observed in postoperative fifth day creatinine clearances values.

Conclusion: Low dose dexmedetomidine has no major effect on urine output and renal indices such as urea, creatinine and creatinine clearances. However, it may have a positive effect on renal functions when total dose is uptitrated, particularly.