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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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Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
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Published on: January 27, 2018

Rating scales for dystonia: a multicenter assessment.

Cynthia L Comella1, Sue Leurgans1, Joanne Wuu1

  • 1Rush-Presbyterian-St. Lukes Medical Center, Chicago, Illinois, USA.

Movement Disorders : Official Journal of the Movement Disorder Society
|March 7, 2003
PubMed
Summary
This summary is machine-generated.

The Global Dystonia Rating Scale (GDS) demonstrated high reliability and internal consistency, proving easier to use than other scales for evaluating dystonia severity. This makes the GDS a potentially superior tool for clinical assessment.

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Area of Science:

  • Neurology
  • Clinical Assessment
  • Movement Disorders

Background:

  • The Fahn-Marsden Scale (F-M) is widely used for dystonia evaluation but lacks extensive multi-center validation.
  • Developing reliable and consistent rating scales is crucial for accurate dystonia assessment and management.

Purpose of the Study:

  • To evaluate the internal consistency and inter-rater reliability of the Unified Dystonia Rating Scale (UDRS) and the Global Dystonia Rating Scale (GDS).
  • To compare the UDRS, F-M, and GDS in terms of their psychometric properties and ease of use among dystonia experts.

Main Methods:

  • Twenty-five dystonia experts assessed the UDRS, F-M, and GDS using videotaped standardized assessments of 100 dystonia patients.
  • Statistical analyses included Cronbach's alpha for internal consistency and intraclass correlation coefficients (ICC), Kendall's coefficient of concordance, and kappa statistics for inter-rater reliability.
  • Raters also evaluated the ease of application for each scale.

Main Results:

  • All three scales (UDRS, F-M, GDS) exhibited excellent internal consistency (Cronbach's alpha 0.89-0.93).
  • Good to excellent inter-rater reliability was observed (ICC 0.71-0.78), with fair to excellent agreement for specific body parts (Kendall's 0.54-0.87; kappa 0.37-0.91).
  • The Global Dystonia Rating Scale (GDS) was found to be the easiest to apply by 74% of raters.

Conclusions:

  • The UDRS, F-M, and GDS are reliable and internally consistent measures for dystonia severity.
  • The GDS's simplicity and ease of application suggest it may be the most practical and useful scale for clinical dystonia assessment.