Related Experiment Videos
Tremor and idiopathic dystonia
C P Jedynak1, A M Bonnet, Y Agid
1Centre Medico-Chirurgical Foch, Suresnes, France.
Summary
Dystonic tremor, often seen with idiopathic dystonia, is a distinct postural tremor characterized by irregularity and association with myoclonus. It differs from essential tremor due to its asymmetry and localized nature.
Area of Science:
- Neurology
- Movement Disorders
Background:
- Idiopathic dystonia is a neurological disorder characterized by involuntary muscle contractions.
- Tremor is a common symptom in various neurological conditions, but its specific characteristics in dystonia require further elucidation.
Purpose of the Study:
- To characterize the clinical and electromyographic features of tremor in patients with idiopathic dystonia.
- To differentiate dystonic tremor from other tremor types, such as essential tremor.
Main Methods:
- Clinical assessment of tremor characteristics in 45 patients with idiopathic dystonia.
- Electromyographic (EMG) analysis to evaluate tremor properties.
Main Results:
- Dystonic tremor was identified as postural, localized, and irregular in amplitude and periodicity.
- The tremor was absent during muscle relaxation and exacerbated by smooth muscle contraction.
- Myoclonus was frequently associated with dystonic tremor.
- Dystonic tremor exhibited greater irregularity, a broader frequency range, asymmetry, and localization compared to essential tremor.
Conclusions:
- Dystonic tremor is a distinct entity, often associated with idiopathic dystonia, characterized by specific clinical and EMG features.
- While resembling essential tremor, dystonic tremor presents with unique characteristics including asymmetry and frequent myoclonus.
- Dystonic tremor can occur with or without other evident dystonic symptoms.