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Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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Dexmedetomidine reduces pain associated with rocuronium injection without causing a decrease in BIS values: a

Jin Joo1, Jungwon Baek1, Jaemin Lee1

  • 1Department of Anesthesiology and Pain Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.

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Summary

Dexmedetomidine effectively reduced injection pain from rocuronium in a dose-dependent manner. This analgesic effect was not linked to changes in the Bispectral Index (BIS) or sedation levels.

Keywords:
Bispectral indexDexmedetomidineInjection painPropofolRocuronium

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Area of Science:

  • Anesthesiology
  • Pharmacology

Background:

  • Pain on injection of anesthetic agents like propofol and rocuronium is a common patient complaint.
  • Dexmedetomidine is known for its sedative and analgesic properties, but its specific effect on injection pain needs clarification.

Purpose of the Study:

  • To evaluate the efficacy of dexmedetomidine in mitigating injection pain caused by propofol and rocuronium.
  • To determine if any observed pain reduction is correlated with dexmedetomidine's sedative effects, measured by the Bispectral Index (BIS).

Main Methods:

  • A randomized, double-blind, placebo-controlled study involving patients undergoing general anesthesia.
  • Patients received varying doses of dexmedetomidine, lidocaine, or saline before anesthetic induction.
  • Pain was assessed using a verbal analog scale (VAS) for propofol and a withdrawal movement scale for rocuronium. BIS values were monitored.

Main Results:

  • Dexmedetomidine significantly decreased the incidence of withdrawal movements associated with rocuronium injection in a dose-dependent manner (P = 0.001).
  • No significant differences in BIS values were observed among the groups post-drug administration or at the time of rocuronium injection.

Conclusions:

  • Dexmedetomidine demonstrates a dose-dependent reduction in pain during rocuronium injection.
  • The observed analgesic effect of dexmedetomidine on injection pain is independent of its sedative action, as indicated by unchanged BIS values.