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Midazolam increases bite force during intravenous sedation.

Ming-Yu Huang1, Nobuyuki Matsuura, Yuzuru Kaneko

  • 1Department of Dental Anesthesiology, Tokyo Dental College, Chiba, Japan.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|June 19, 2012
PubMed
Summary
This summary is machine-generated.

Midazolam sedation decreased grip strength but unexpectedly increased bite force in healthy volunteers. This enhanced bite force persisted even after flumazenil reversal, suggesting complex effects on muscle power.

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Area of Science:

  • Anesthesiology
  • Pharmacology
  • Neuromuscular Physiology

Background:

  • Midazolam is commonly used for moderate sedation.
  • Its effects on vital functions and recovery are well-documented.
  • However, its impact on muscle power during sedation remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of midazolam on muscle power during moderate sedation.
  • To assess changes in grip strength and bite force.

Main Methods:

  • 20 healthy male volunteers participated in a randomized crossover study.
  • Midazolam (0.05 mg/kg) was administered, followed by flumazenil for reversal.
  • Muscle power was measured using grip strength and bite force.
  • Vital signs, sedation levels, and cognitive function were also monitored.

Main Results:

  • Midazolam decreased grip strength and cognitive function (Stroop test).
  • Bite force significantly increased immediately after midazolam administration.
  • This increase in bite force persisted even after flumazenil administration.

Conclusions:

  • Midazolam's sedative effects are associated with decreased grip strength.
  • Paradoxically, midazolam increased bite force, an effect not fully explained by its muscle-relaxant properties.
  • The persistent increase in bite force after flumazenil suggests complex central or peripheral mechanisms involved.