The Effect Of Dexmedetomidine On Bispectral Index Monito ring In Children

The primary aim of this study was to test whether dexmedetomidine administration based on the bispectral index (BIS) monitoring caused a reduction in consumption of sevoflurane. Following Institutional Ethic Committee approval and written informed consent from all parents, fifty-four children undergoing sevoflurane anaesthesia randomly allocated to receive either dexmedetomidine (Group D) or saline (Group S). The anaesthesia was induced with 8% sevoflurane in nitrous oxide/oxygen in all children. Following anaesthesia induction, Group D (n=27) children received a loading dose of dexmedetomidine 1 μgkg–1 IV over ten minutes, followed by a continuous infusion at a rate of 0.5 μgkg–1 hr–1 throughout the surgery. Group S (n=27) children received same volume of saline infusion due to obtained blindness. Systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), body temperature and peripheral oxygen saturation (SpO2), end-tidal concentrations of oxygen, carbon dioxide (ETCO2), and sevoflurane (ETsevo) were monitorized. Bispectral index numbers and ETsevo concentrations were recorded at 2 min before incision, 2 min after incision, at the end of surgery and before the termination of anaesthesia, and finally immediately after wake-up from anaesthesia (Final BIS number). BIS number was found significantly lower in group D at before incision, after incision and at the end of surgery than in group S (p=0.000, 0.001, 0.007). End tidal sevoflurane concentrations were significantly higher in group S at before incision, after incision and at the end of surgery than in group D (p 0.000 to p 0.001). Final BIS number and sevoflurane concentrations were similar and there were no significant difference between the groups. It was concluded that intravenous (IV) dexmedetomidine infusion at a rate of 0.5 μgkg–1 hr–1 during sevoflurane anaesthesia significantly reduces end-tidal sevoflurane concentration and BIS number in children undergoing minor surgical interventions