Journal of Anesthesia

, Volume 24, Issue 2, pp 182–186 | Cite as

EC50 of remifentanil to prevent withdrawal movement associated with injection of rocuronium

  • Ji Young Yoon
  • Hae Kyu Kim
  • Jae Young Kwon
  • Sang Wook Shin
  • Kyung Hoon Kim
  • Won Sung Kim
  • Tae Kyun Kim
Original Article

Abstract

Purpose

Various strategies have been studied to reduce the discomfort of rocuronium injection. This study was designed to determine the effect-site target concentration (Ce) of remifentanil at which there was a 50% probability of preventing movement from pain in response to the injection of rocuronium (EC50).

Methods

Anesthesia was induced with a propofol target-controlled infusion (TCI, Marsh model) and remifentanil TCI (Minto model). Effect-site target concentration of propofol was 3 μg/ml. Ce of remifentanil for the first patient started at 2.0 ng/ml. Ce of remifentanil for each subsequent patient was determined by the response of the previous patient by the Dixon up-and-down method with an interval of 0.5 ng/ml. After both drugs reached target concentration, rocuronium 0.8 mg/kg was administered, and the pain response was observed.

Results

The EC50 of remifentanil was 1.5 ± 0.45 ng/ml by Dixon’s up-and-down method. From probit analysis, the EC50 of remifentanil was 1.37 ng/ml (95% confidence limits, 0.69–2.15 ng/ml), and the EC95 was 3.19 ng/ml (95% confidence limits, 2.31–11.24 ng/ml).

Conclusion

The EC50 of remifentanil to blunt the withdrawal responses to rocuronium injection was 1.37–1.5 ng/ml during 3 μg/ml propofol TCI anesthesia.

Keywords

EC50 Remifentanil Rocuronium Up-and-down method 

Notes

Acknowledgments

This work was supported by a clinical research grant from Pusan National University Hospital in 2008.

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Copyright information

© Japanese Society of Anesthesiologists 2010

Authors and Affiliations

  • Ji Young Yoon
    • 1
  • Hae Kyu Kim
    • 1
  • Jae Young Kwon
    • 1
  • Sang Wook Shin
    • 1
  • Kyung Hoon Kim
    • 1
  • Won Sung Kim
    • 1
  • Tae Kyun Kim
    • 1
  1. 1.Department of Anesthesia and Pain Medicine, School of MedicinePusan National UniversityBusanKorea

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