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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.
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Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
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Equine botulism.

Kali Slavik1, Robert Whitlock1, Amy Johnson1

  • 1Department of Clinical Studies-New Bolton, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA.

Equine Veterinary Journal
|June 16, 2025
PubMed
Summary
This summary is machine-generated.

Equine botulism, caused by Clostridium botulinum, is a serious paralytic disease in horses. Early diagnosis and intensive care are crucial for managing this often fatal condition.

Keywords:
BoNTClostridium botulinumhorseneuromuscularneurotoxin

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Area of Science:

  • Veterinary Medicine
  • Equine Health
  • Toxicology

Background:

  • Botulism is a severe, frequently fatal neurologic disease affecting horses globally.
  • Caused by Clostridium botulinum neurotoxins, it leads to neuromuscular blockade and flaccid paralysis.
  • Diagnosis is challenging, often relying on clinical signs due to impracticality of definitive testing.

Purpose of the Study:

  • To review current knowledge on equine botulism.
  • To cover pathophysiology, clinical signs, diagnostics, and treatment strategies.
  • To discuss prevention methods for Clostridium botulinum infections in horses.

Main Methods:

  • Literature review of existing studies and case reports on equine botulism.
  • Synthesis of information on the disease's epidemiology, pathogenesis, and clinical manifestations.
  • Compilation of current diagnostic approaches and therapeutic interventions.

Main Results:

  • Clostridium botulinum produces a potent neurotoxin causing paralysis.
  • Recumbent horses require intensive nursing care, posing significant treatment challenges.
  • Delayed diagnosis and treatment correlate with poor patient outcomes.

Conclusions:

  • Equine botulism necessitates prompt recognition and management.
  • Further research into improved diagnostic tools and treatments is warranted.
  • Preventative measures and awareness are key to reducing incidence and mortality.