Korean Journal of Anesthesiology

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Randomized Controlled Trial
Korean J Anesthesiol. 2006;51(2):147-150.
DOI: https://doi.org/10.4097/kjae.2006.51.2.147
The Effect of Remifentanil on the Loss of Consciousness during Propofol Infusion.
Sung Yong Park, Sang Ki Min, Bong Ki Moon, Yun Jeong Chae, Won Ho Jeong, Jong Yeop Kim
Department of Anesthesiology and Pain Medicine, College of Medicine, Ajou University, Suwon, Korea. kjyeop@ajou.ac.kr
Abstract
BACKGROUND
General anesthesia is a balance between hypnosis and analgesia. Remifentanil is often combined with propofol to both induce and maintain total intravenous anesthesia. This study evaluated the effect of remifentanil on the propofol requirements for a loss of consciousness.
METHODS
Forty adult patients with ASA 1 or 2 were enrolled in this study. The patients were randomly given either saline or remifentanil before the induction of anesthesia with an infusion of propofol, 15 mg/kg/h. In the remifentanil group, all the patients received a computer controlled infusion of remifentanil with a effect site concentration of 4 ng/ml. The times required for the patient to lose consciousness, the propofol requirements and the bispectral index at the loss of consciousness to verbal commands were recorded.
RESULTS
In the remifentanil group, loss of consciousness was attained significantly faster and with lower propofol doses than in the saline group. The bispectral indices were significantly higher at loss of consciousness in the remifentanil group.
CONCLUSIONS
A remifentanil infusion before the induction of propofol anesthesia significantly reduces the propofol requirements for the loss of consciousness. Remifentanil enhances the hypnotic effect of propofol.

Keywords :loss of consciousness;remifentanil;requirement of propofol

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