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Severe and unclassifiable tremor.

Marcos Serrano-Dueñas1

  • 1Pontificia Universidad Católica del Ecuador, Facultad de Medicina, Quito, Ecuador.

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|October 13, 2024
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Summary
This summary is machine-generated.

Unclassifiable tremors are severe and disabling, often linked to anxiety, depression, and cerebellar atrophy. These tremors show poor response to current pharmacological treatments.

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Area of Science:

  • Neurology
  • Movement Disorders

Background:

  • Severe and disabling tremors often lack clear characterization.
  • Essential tremor (ET) patients meeting International Parkinson Disease and Movement Disorder Society (IPDMDS) criteria were used as controls.

Purpose of the Study:

  • To investigate a series of 37 cases with unclassifiable tremors.
  • To compare these cases with well-defined essential tremor controls.

Main Methods:

  • Data collection included demographics, clinical information, Mini-Mental State Examination (MMSE), Hospital Anxiety and Depression Scale (HADS), Fahn-Tolosa-Marín Tremor Rating Scale (TRS), and Quality of Life in Essential Tremor (QUEST).
  • Brain magnetic resonance imaging (MRI) was performed for all participants.
  • Statistical analysis involved Chi-squared and t-tests, with significance set at p ≤ 0.01.

Main Results:

  • Unclassifiable tremor cases showed significantly higher HADS, TRS, and QUEST scores compared to controls.
  • Cases exhibited higher incidences of orthostasis and rest tremor, while controls had a higher history of enolism.
  • Cerebellar atrophy was noted in all cases and 24 controls; dystonia was observed in 7 cases.

Conclusions:

  • A subset of patients presents with unclassifiable, severely disabling tremors.
  • These tremors are associated with specific clinical and imaging findings.
  • Current pharmacological therapies appear ineffective for these challenging tremor cases.