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Related Experiment Videos

Essential tremor: functional disability vs. subjective impairment.

E Auff1, A Doppelbauer, E Fertl

  • 1Neurological Clinic, University of Vienna, Austria.

Journal of Neural Transmission. Supplementum
|January 1, 1991
PubMed
Summary
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Essential tremor (ET) patients often experience a disconnect between their actual motor function and how impaired they feel. Subjective feelings of disability in essential tremor correlate with daily living tasks, aiding in objective assessment.

Area of Science:

  • Neurology
  • Clinical Neuroscience

Background:

  • Essential tremor (ET) is a common neurological disorder characterized by involuntary, rhythmic shaking.
  • The subjective experience of disability in ET patients can significantly impact quality of life.
  • Understanding the relationship between objective motor deficits and patient-reported outcomes is crucial for effective management.

Purpose of the Study:

  • To investigate the correlation between functional (motor) disabilities and subjective impairment in patients with essential tremor.
  • To identify which measures best reflect the patient's perceived level of disability.

Main Methods:

  • Seventy-eight patients diagnosed with essential tremor were assessed.
  • Subjective impairment was evaluated using various self-rating scales (e.g., Zung, v. Zerssen).

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  • Objective motor disability was measured using semiquantitative clinical scores for action tremor and a standardized motor performance test (Motorische Leistungsserie nach Schoppe).

    • Main Results:

    • A significant portion of patients (2/5) reported severe subjective impairment, and 1/3 experienced depressive symptoms.
    • There was considerable variability in subjective impairment among patients with similar objective motor disabilities.
    • Semiquantitative clinical scores for action tremor showed the strongest correlation with subjective impairment in activities of daily living.
    • Objective motor performance tests correlated well with subjective difficulties in simple daily tasks like drinking and writing.

    Conclusions:

    • Subjective impairment in essential tremor does not always align with objective motor deficits.
    • Clinical assessment of action tremor and patient-reported difficulties in simple daily tasks can effectively estimate objective motor disability.
    • This approach may prove valuable for longitudinal studies monitoring essential tremor progression and treatment efficacy.