Optimal effect-site concentration of remifentanil for minimizing cardiovascular changes caused by fiberoptic nasotracheal intubation
김은정, 전현욱, 김태균, 윤지욱, 윤지영,
소속 상세정보
김은정 ( Kim Eun-Jung ) - Pusan National University Dental Hospital Department of Dental Anesthesia and Pain Medicine
전현욱 ( Jeon Hyun-Wook ) - Pusan National University Dental Hospital Department of Dental Anesthesia and Pain Medicine
김태균 ( Kim Tae-Kyun ) - Pusan National University Yangsan Hospital Department of Anesthesia and Pain Medicine
윤지욱 ( Yoon Ji-Uk ) - Pusan National University Yangsan Hospital Department of Anesthesia and Pain Medicine
윤지영 ( Yoon Ji-Young ) - Pusan National University Dental Hospital Department of Dental Anesthesia and Pain Medicine
KMID : 0980320150150040221
Abstract
Background: Endotracheal intubation induces clinically adverse cardiovascular changes. Various pharmacological strategies for controlling these responses have been suggested with opioids being widely administered. In this study, the optimal effect-site concentration (Ce) of remifentanil for minimizing hemodynamic responses to fiberoptic nasotracheal intubation was evaluated.
Methods: Thirty patients, aged 18-63 years, scheduled for elective surgery were included. Anesthesia was induced with a propofol and remifentanil infusion via target-controlled infusion (TCI). Remifentanil infusion was initiated at 3.0 ng/mL, and the response of each patient determined the Ce of remifentanil for the next patient by the Dixon up-and-down method at an interval of 0.5 ng/mL. Rocuronium was administered after propofol and remifentanil reached their preset Ce; 90 seconds later fiberoptic nasotracheal intubation was initiated. Non-invasive blood pressure and heart rate (HR) were measured at pre-induction, the time Ce was reached, immediately before and after intubation, and at 1 and 3 minutes after intubation. The up-and-down criteria comprised a 20% change in mean blood pressure and HR between just prior to intubation and 1 minute after intubation.
Results: The median effective effect-site concentration (EC50) of remifentanil was 3.11 ± 0.38 ng/mL by the Dixon's up-and-down method. From the probit analysis, the EC50 of remifentanil was 3.43 ng/mL (95% confidence interval, 2.90-4.06 ng/mL). In PAVA, the EC50 and EC95 of remifentanil were 3.57 ng/mL (95% CI, 2.95-3.89) and 4.35 ng/mL (95% CI, 3.93-4.45). No remifentanil-related complications were observed.
Conclusions: The EC50 of remifentanil for minimizing the cardiovascular changes and side effects associated with fiberoptic nasotracheal intubation was 3.11-3.43 ng/mL during propofol TCI anesthesia with a Ce of 4 ug/mL.
키워드
Nasotracheal intubation; Propofol; Remifentanil
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