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Related Experiment Videos

Tremor in reflex sympathetic dystrophy.

G Deuschl1, H Blumberg, C H Lücking

  • 1Department of Neurology, University of Freiburg Breisgau, Germany.

Archives of Neurology
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

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Reflex sympathetic dystrophy (RSD) can cause noticeable hand tremor in affected limbs. This tremor, resembling an enhanced physiological tremor, often resolves with treatment and may be linked to sympathetic nervous system activity.

Area of Science:

  • Neurology
  • Physiology
  • Biomedical Engineering

Background:

  • Reflex sympathetic dystrophy (RSD), also known as complex regional pain syndrome, is a poorly understood condition.
  • Hand tremor is a common but not fully characterized symptom in RSD patients.

Purpose of the Study:

  • To quantitatively assess postural hand tremor in patients with unilateral RSD.
  • To explore the relationship between tremor characteristics and RSD symptoms.
  • To investigate the role of sympathetic nervous system activity in RSD-associated tremor.

Main Methods:

  • Quantitative analysis of postural hand tremor in 21 patients with unilateral upper extremity RSD.
  • Electromyography (EMG) was used to measure tremor frequency and amplitude.
  • Tremor response to increasing limb weight and sympatholytic intervention was evaluated.

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Main Results:

  • 57% of patients exhibited enhanced tremor amplitude on the affected side, with a mean frequency of 7.2 Hz.
  • RSD tremor frequency shifted towards lower values with increased limb loading, similar to physiological tremor.
  • Tremor resolved upon recovery from RSD and normalized after acute sympatholytic treatment.

Conclusions:

  • RSD should be considered a potential cause of tremor.
  • The tremor observed in RSD appears to be an enhanced form of physiological tremor.
  • Sympathetic nervous system dysfunction significantly contributes to the development of tremor in RSD.