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Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

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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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Developing a Consistent, Reproducible Botulinum Toxin Type A Dosing Method for Upper Limb Tremor by Kinematic

Olivia Samotus1,2, Jack Lee3, Mandar Jog1

  • 1Department of Clinical Neurological Sciences, London Health Sciences Centre-Lawson Health Research Institute, 339 Windermere Road, A10-026, London, ON N6A 5A5, Canada.

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Summary

Customizing botulinum toxin type A (BoNT-A) injections using a kinematic-based method improves tremor reduction for Essential Tremor and Parkinson's disease. This approach standardizes dosing for better whole-arm tremor treatment.

Keywords:
botulinum toxinclinical-decision supportcomputer-assisted dosingdosing algorithminjection patternkinematicstreatment planningupper limb tremor

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Area of Science:

  • Neurology
  • Biomedical Engineering
  • Movement Disorders

Background:

  • Essential Tremor (ET) and Parkinson's disease (PD) tremor therapies often use fixed-dose botulinum toxin type A (BoNT-A) injections.
  • This approach may not optimize efficacy or minimize adverse effects for individual patient tremor characteristics.

Purpose of the Study:

  • To develop and validate a kinematic-based dosing method for standardizing and customizing BoNT-A injections for ET and PD tremors.
  • To assess the efficacy of this method in improving tremor reduction and dose selection.

Main Methods:

  • A retrospective analysis of 15 ET and PD participants identified optimal BoNT-A dosages per joint based on baseline tremor amplitudes.
  • A prospective validation in 78 ET and PD participants utilized the kinematic-based method for injection pattern selection and assessed tremor changes.
  • Whole-arm kinematic tremor analysis was performed at baseline and 6 weeks post-injection.

Main Results:

  • The kinematic-based dosing method showed significant associations between baseline tremor amplitudes and optimized BoNT-A dosages across all joints.
  • Prospective validation demonstrated significant tremor reduction at each joint, correlated with BoNT-A dosages, in all participants.
  • The method provided consistency in dose selection and subsequent tremor reduction for whole-arm tremor treatment.

Conclusions:

  • A kinematic-based dosing method offers a standardized and customized approach for BoNT-A injections in ET and PD tremor therapy.
  • This method enhances treatment efficacy and consistency, leading to improved tremor reduction.
  • It provides a valuable tool for standardizing tremor assessments and planning whole-arm tremor treatments.