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Chinese Journal of Clinical Pharmacology and Therapeutics ›› 2019, Vol. 24 ›› Issue (8): 922-927.doi: 10.12092/j.issn.1009-2501.2019.08.012

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Effects of dexmedetomidine on the median effective plasma concentration of remifentanil for excellent tracheal intubation during sevoflurane induction without neuromuscular blockade

LIAO Zhaoxia, ZHOU Lisheng, LU Fuding, LI Yujuan   

  1. Department of Anesthesiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, Guangdong, China
  • Received:2019-04-15 Revised:2019-06-27 Online:2019-08-26 Published:2019-08-30

Abstract:

AIM: To explore the effects of dexmedetomidine on the 50% effective plasma concentration (Cp50) of remifentanil for excellent tracheal intubation during sevoflurane induction without neuromuscular blockade. METHODS: Forty-five patients undergoing selective general anesthesia were randomly assigned into two groups: infusion of 0.6 μg/kg dexmedetomidine over 15 min (group D, n=21), saline group (group C, n=24).For induction, 8% sevoflurane induction was immediately begun in vital capacity until the loss of eyelash reflex, with end-tidal sevoflurane 3% subsequently was maintained. And the initial doses of remifentanil target-controlled infusion were set at 3 ng/mL for group D and 4 ng/mL for group C, and were decreased or increased by 0.2 ng/mL in the next patient using the Dixon's up-and-down method based on the success or failure of intubation. Laryngoscopy and intubation were performed, 90 s after achieving the target concentration of remifentanil. Tracheal intubation conditions and hemodynamics were recorded and compared.RESULTS:In group C and group D, the Cp50 of remifentanil for successful tracheal intubation were 3.079 ng/mL(95% CI 2.898-3.240)and 2.468 ng/mL(95% CI 2.239-2.630), respectively. CONCLUSION:Dexmedetomidine contributes to the reduced Cp50 of remifentanil by 19.8% for excellent tracheal intubation during sevoflurane induction without neuromuscular blockade.

Key words: dexmedetomidine, remifentanil, sevoflurane, intubation, target-controlled infusion (TCI)

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