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[Midazolam in anesthesiology].

F García-Pedrajas1, J L Arroyo

  • 1Dpto. de Anestesiología y Reanimación, Clínica Universitaria, Facultad de Medicina, Pamplona.

Revista De Medicina De La Universidad De Navarra
|October 1, 1989
PubMed
Summary
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Midazolam (MDZ), an annelated benzodiazepine, offers improved solubility, faster action, and shorter half-life compared to classical benzodiazepines. It is a safe option for anesthesia and sedation with moderate effects and no teratogenic risks.

Area of Science:

  • Pharmacology
  • Medicinal Chemistry

Context:

  • Midazolam (MDZ) is an annelated benzodiazepine (BZD) synthesized in 1976.
  • It features a unique five-membered heterocycle fused to the diazepine nucleus, differentiating it from classical BZDs.

Purpose:

  • To highlight the distinct properties of Midazolam (MDZ) compared to classical benzodiazepines.
  • To detail the pharmacokinetic and pharmacodynamic advantages of MDZ.
  • To outline the applications of MDZ in anesthesiology.

Summary:

  • The fused imidazol ring in MDZ alters solubility, metabolism, and aqueous stability.
  • MDZ exhibits enhanced local tolerance, rapid onset, high plasma clearance, and a short elimination half-life (1.7-2.4 hr) without active metabolites.
  • Bioavailability varies: 92% (IV), 82-91% (IM), and 50-52% (oral), with consistent CNS effects across routes.

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Impact:

  • MDZ is versatile in anesthesiology for premedication, induction, maintenance, and sedation.
  • It possesses a wide safety margin with moderate cardiovascular and respiratory effects.
  • MDZ demonstrates a lack of teratogenic or embryotoxic effects, enhancing its safety profile.