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Related Concept Videos

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

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Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
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Skeletal Muscle Relaxants: Therapeutic Uses01:31

Skeletal Muscle Relaxants: Therapeutic Uses

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Skeletal muscle relaxants are used to relax muscle tone and alleviate painful muscle contractions. However, the choice of skeletal muscle relaxants depends on the duration of the surgical procedure in order to minimize potential side effects. Skeletal muscle relaxants like neuromuscular blocking agents [NMBAs] are commonly employed as adjuvants alongside general anesthetics in clinical settings. NMBAs are also used to maintain controlled ventilation during surgery of the larynx or pharynx...
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Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

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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...
310
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
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Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

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Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
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Related Experiment Video

Updated: Jun 7, 2025

A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors
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Innovation in Botulinum Toxins.

Reema Rashied1, Michael H Gold2

  • 1Department of Medicine, Chicago Medical School, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL 60064, USA.

Dermatologic Clinics
|November 14, 2024
PubMed
Summary

Recent trials show high-dose and liquid neurotoxins effectively treat glabellar lines. These advanced formulations offer longer-lasting wrinkle reduction and improved patient outcomes in esthetic medicine.

Keywords:
Botulinum toxinCosmetic dermatologyEsthetic medicineGlabellar linesHigh-dose toxinsLiquid toxins

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Area of Science:

  • Aesthetic Medicine
  • Dermatology
  • Pharmacology

Background:

  • Glabellar lines (frown lines) are a common concern in aesthetic medicine.
  • Traditional neurotoxin formulations have limitations in onset, duration, and dosage flexibility.
  • There is a continuous need for improved treatments for moderate to severe glabellar lines.

Purpose of the Study:

  • To analyze and discuss recent clinical trials on high-dose and liquid neurotoxins.
  • To assess the effectiveness and safety of these novel formulations for glabellar lines.
  • To evaluate patient outcomes and compare new toxins to traditional ones.

Main Methods:

  • Comprehensive literature review of clinical studies.
  • Analysis of patient outcomes data from recent trials.
  • Comparative assessment of high-dose and liquid neurotoxin formulations.

Main Results:

  • High-dose neurotoxins demonstrated prolonged muscle relaxation and significant wrinkle reduction.
  • Liquid neurotoxins showed comparable efficacy to traditional forms, with faster onset and longer duration.
  • Both high-dose and liquid formulations exhibited well-tolerated safety profiles.

Conclusions:

  • High-dose and liquid neurotoxins represent significant advancements in treating glabellar lines.
  • These novel formulations offer enhanced efficacy, duration, and patient experience.
  • They provide expanded options for achieving natural-looking, long-lasting aesthetic results.