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摘要

Background: This study undertook to compare the effect-site concentration of remifentanil for prevention of hemodynamic responses to endotracheal intubation, employing the single-lumen tracheal tube and the double-lumen bronchial tube during total intravenous anesthesia. Methods: Based on the nature of the surgery, 38 patients undergoing general anesthesia were assigned either to the single- lumen tube group or the double-lumen tube group. Anesthesia was induced by a target controlled infusion of propofol, with an effect-site concentration of 4 μg/ml. Remifentanil was then administered to the first patient in each group, with an effect-site concentration of 3.5 ng/ml. Subsequent concentration of remifentanil was determined by hemodynamic responses of the previous patient to intubation, based on the up-and-down method. Results: The effect-site concentrations of remifentanil for prevention of hemodynamic responses to endotracheal intubation in 50% of patients (EC50) were 2.8 ng/ml (95% CI, 2.0–3.7 ng/ml) in the single-lumen tube group, and 2.9 ng/ml (95% CI, 2.5–3.2 ng/ml) in the double-lumen tube group. No significant difference was observed between the two groups. Conclusions: The effect-site concentration of remifentanil for prevention of hemodynamic responses to endotracheal intubation did not differ during total intravenous anesthesia, using either the single-lumen tracheal tube or the double-lumen bronchial tube.