Movement Disorders (revue)

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Mirror movements in patients with essential tremor.

Identifieur interne : 001B51 ( PubMed/Corpus ); précédent : 001B50; suivant : 001B52

Mirror movements in patients with essential tremor.

Auteurs : Elan D. Louis ; Eileen Rios ; Claire Henchcliffe

Source :

RBID : pubmed:19795466

English descriptors

Abstract

Mirror movements (MM), which occur in age-related neurodegenerative diseases such as Parkinson's disease (PD), have never been studied in essential tremor (ET). The objective of this work is to study the prevalence and clinical correlates of MM in ET cases and controls. In a clinical-epidemiological study in New York, participants performed repetitive motor tasks; MM (hands and feet) were rated. MM occurred in 35/107 (32.7%) ET cases versus 23/97 (23.7%) controls (OR 1.56, P = 0.16). Total MM score was 2x higher in cases (3.9 +/- 7.7 vs. 1.9 +/- 3.9, P = 0.02). MM (hands) occurred in 16 (15.0%) cases versus 5 (5.2%) controls (OR 3.24, P = 0.03) and total hand MM score was three to four times higher in ET cases (1.4 +/- 4.5 vs. 0.4 +/- 2.0, P = 0.03). MMs were not correlated with age, tremor duration, or severity and were most severe in cases with rest tremor. Thus, it was concluded that MM occurred in 1/3 of ET cases. These results further expand the spectrum of nontremor, motor phenomenology seen in ET. Whether, as in PD, MMs in ET represent a failure of subcortical structures to support the cortical network involved with the initiation of unilateral motor activity, requires future neurophysiological investigation.

DOI: 10.1002/mds.22749
PubMed: 19795466

Links to Exploration step

pubmed:19795466

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<div type="abstract" xml:lang="en">Mirror movements (MM), which occur in age-related neurodegenerative diseases such as Parkinson's disease (PD), have never been studied in essential tremor (ET). The objective of this work is to study the prevalence and clinical correlates of MM in ET cases and controls. In a clinical-epidemiological study in New York, participants performed repetitive motor tasks; MM (hands and feet) were rated. MM occurred in 35/107 (32.7%) ET cases versus 23/97 (23.7%) controls (OR 1.56, P = 0.16). Total MM score was 2x higher in cases (3.9 +/- 7.7 vs. 1.9 +/- 3.9, P = 0.02). MM (hands) occurred in 16 (15.0%) cases versus 5 (5.2%) controls (OR 3.24, P = 0.03) and total hand MM score was three to four times higher in ET cases (1.4 +/- 4.5 vs. 0.4 +/- 2.0, P = 0.03). MMs were not correlated with age, tremor duration, or severity and were most severe in cases with rest tremor. Thus, it was concluded that MM occurred in 1/3 of ET cases. These results further expand the spectrum of nontremor, motor phenomenology seen in ET. Whether, as in PD, MMs in ET represent a failure of subcortical structures to support the cortical network involved with the initiation of unilateral motor activity, requires future neurophysiological investigation.</div>
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