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The effect of dexmedetomidine pretreatment on the median effective bolus dose of propofol for facilitating laryngeal mask airway insertion

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A Letter to the Editor to this article was published on 17 October 2016

Abstract

Background

We designed this study to investigate the effect of dexmedetomidine (1 μg/kg) pretreatment on the median effective dose (ED50) of propofol for facilitating successful laryngeal mask airway (LMA) insertion compared to propofol alone.

Methods

Forty patients were randomized to either the control group (n = 21) or the dexmedetomidine group (n = 19). After infusion of normal saline or dexmedetomidine 1 µg/kg over 10 min, 1 % lidocaine 0.5 mg/kg, followed by propofol 2.5 mg/kg was administered and the laryngeal mask airway was inserted without muscle relaxants. The ED50 of propofol for successful LMA insertion was determined by the modified Dixon’s up-and-down method. The ED50 and ED95 were also calculated using an isotonic regression method, based on the pooled adjacent-violators algorithm-adjusted response rate, and the confidential interval (CI) was estimated using a bootstrap approach.

Results

The ED50 of propofol for smooth insertion of the LMA was significantly higher in the control group than in the dexmedetomidine group (3.1 ± 0.4 vs 1.9 ± 0.3 mg/kg, P < 0.001). From isotonic regression analysis using a bootstrap approach, the ED50 and ED95 of propofol was 2.9 mg/kg (83 % CI 2.5–3.3 mg/kg) and 3.9 mg/kg (95 % CI 3.5–4.0 mg/kg) in the control group, and 1.8 mg/kg (83 % CI 1.8–2.1 mg/kg) and 2.4 mg/kg (95 % CI 2.0–2.5 mg/kg) in the dexmedetomidine groups, respectively. The apnea time was not significantly different between the two groups.

Conclusions

Pretreatment with dexmedetomidine 1 μg/kg could reduce the propofol requirement by 38 % for facilitating LMA insertion without prolonged respiratory depression and hemodynamic instability.

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Authors and Affiliations

  1. Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, San 5, Wonchon-dong, Yeongtong-gu, Suwon, 443-721, Korea

    Ji Young Yoo, Chu Kyung Park, Sook Young Lee & Jong Yeop Kim

  2. Department of Anesthesiology and Pain Medicine, Gachon University, Gil Medical Center, Incheon, Korea

    Hyun Jeong Kwak & Yong Beom Kim

Authors
  1. Ji Young Yoo
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  2. Hyun Jeong Kwak
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  3. Yong Beom Kim
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  4. Chu Kyung Park
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  5. Sook Young Lee
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  6. Jong Yeop Kim
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Correspondence to Jong Yeop Kim.

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Yoo, J.Y., Kwak, H.J., Kim, Y.B. et al. The effect of dexmedetomidine pretreatment on the median effective bolus dose of propofol for facilitating laryngeal mask airway insertion. J Anesth 31, 11–17 (2017). https://doi.org/10.1007/s00540-016-2245-7

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  • DOI: https://doi.org/10.1007/s00540-016-2245-7

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