Effects of dexmedetomidine-propofol-fentanyl combined anesthesia on somatosensory and motor evoked potentials in patients undergoing cervical spine surgery / 中华麻醉学杂志

ABSTRACT

Objective To evaluate the effects of dexmedetomidine-propofol-fentanyl combined anesthesia on somatosensory evoked potentials (SEPs) and motor evoked potentials (MEPs) in patients undergoing cervical spine surgery. Methods Thirty-six patients undergoing cervical spine surgery were randomly divided into 2 groups (n = 18 each) propofol-fentanyl combined anesthesia group (group C) and dexmedetomidine-propofol-fentanyl combined anesthesia group (group D). Anesthesia was induced with TCI of propofol and iv injection of fentanyl.After the consciousness disappeared, a laryngeal mask airway was placed and the patients were ventilated. In group D, dexmedetomidine 0.5 μg/kg was injected over 10 min after the consciousness disappeared, followed by an infusion at a rate of 0.5 μg·kg-1 ·h-1 until the end of surgery. In group C, the equal volume of normal saline was administered instead of dexmedetomidine. SEPs (P15-N20) amplitudes and latency were measured and recorded before dexmedetomidine administration and at 10 min of dexmedetomidine infusion. The no-elicitation of MEPs was recorded. Results Compared with group C, there was no significant difference in P15-N20 amplitudes and latency in group D. The no-elicitation rate of MEPs in two groups was 0. Conclusion Dexmedetomidine-propofol-fentanyl combined anesthesia does not affect SEPs and MEPs in patients undergoing cervical spine surgery.