ParkinsonCanadaV1, Main, Exploration, bibRecord, 000D53

Increased motor cortical facilitation and decreased inhibition in Parkinson disease

Identifieur interne : 000D53 ( Main/Exploration ); précédent : 000D52; suivant : 000D54

Increased motor cortical facilitation and decreased inhibition in Parkinson disease

Auteurs : Zhen Ni ; Nina Bahl ; Carolyn A. Gunraj ; Filomena Mazzella ; Robert Chen

Source :

Neurology [ 0028-3878 ] ; 2013.

RBID : PMC:3719423

English descriptors

KwdEn :
- Aged, Electromyography (methods), Evoked Potentials, Motor (physiology), Female, Humans, Male, Middle Aged, Motor Cortex (pathology), Motor Cortex (physiology), Neural Inhibition (physiology), Parkinson Disease (physiopathology), Parkinson Disease (therapy), Transcranial Magnetic Stimulation (methods).
MESH :
- methods : Electromyography, Transcranial Magnetic Stimulation.
- pathology : Motor Cortex.
- physiology : Evoked Potentials, Motor, Motor Cortex, Neural Inhibition.
- physiopathology : Parkinson Disease.
- therapy : Parkinson Disease.
- Aged, Female, Humans, Male, Middle Aged.

Abstract

Objective:

To identify the changes in motor cortical facilitatory and inhibitory circuits in Parkinson disease (PD) by detailed studies of their time courses and interactions.

Methods:

Short-interval intracortical facilitation (SICF) and short-interval intracortical inhibition (SICI) were measured with a paired-pulse paradigm using transcranial magnetic stimulation. Twelve patients with PD in both ON and OFF medication states and 12 age-matched healthy controls were tested. The first experiment tested the time course of SICF in PD and controls. The second experiment tested SICI at different times corresponding to SICF peaks and troughs to investigate whether SICI was affected by SICF.

Results:

SICF was increased in PD OFF state and was reduced by dopaminergic medications. The reduction in SICF from the OFF to ON state correlated with the improvement in PD motor signs. SICI was reduced in PD OFF state and was only partially normalized by dopaminergic medications. At SICF peaks, improvement in SICI with medication correlated with improvement in PD motor sign. Principal component analysis showed that variations of SICF and SICI were explained by the same principal component only in the PD OFF group, suggesting that decreased SICI in the OFF state is related to increased SICF.

Conclusions:

Motor cortical facilitation is increased and inhibition is decreased in PD. Increased cortical facilitation partly accounts for the decreased inhibition, but there is also impairment in synaptic inhibition in PD. Increased cortical facilitation may be a compensatory mechanism in PD.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3719423

DOI: 10.1212/WNL.0b013e3182919029
PubMed: 23576626
PubMed Central: 3719423

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en"><sec><title>Objective:</title>
<p>To identify the changes in motor cortical facilitatory and inhibitory circuits in Parkinson disease (PD) by detailed studies of their time courses and interactions.</p>
</sec>
<sec><title>Methods:</title>
<p>Short-interval intracortical facilitation (SICF) and short-interval intracortical inhibition (SICI) were measured with a paired-pulse paradigm using transcranial magnetic stimulation. Twelve patients with PD in both ON and OFF medication states and 12 age-matched healthy controls were tested. The first experiment tested the time course of SICF in PD and controls. The second experiment tested SICI at different times corresponding to SICF peaks and troughs to investigate whether SICI was affected by SICF.</p>
</sec>
<sec><title>Results:</title>
<p>SICF was increased in PD OFF state and was reduced by dopaminergic medications. The reduction in SICF from the OFF to ON state correlated with the improvement in PD motor signs. SICI was reduced in PD OFF state and was only partially normalized by dopaminergic medications. At SICF peaks, improvement in SICI with medication correlated with improvement in PD motor sign. Principal component analysis showed that variations of SICF and SICI were explained by the same principal component only in the PD OFF group, suggesting that decreased SICI in the OFF state is related to increased SICF.</p>
</sec>
<sec><title>Conclusions:</title>
<p>Motor cortical facilitation is increased and inhibition is decreased in PD. Increased cortical facilitation partly accounts for the decreased inhibition, but there is also impairment in synaptic inhibition in PD. Increased cortical facilitation may be a compensatory mechanism in PD.</p>
</sec>
</div>
</front>
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<name sortKey="Ni, Zhen" sort="Ni, Zhen" uniqKey="Ni Z" first="Zhen" last="Ni">Zhen Ni</name>
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La maladie de Parkinson au Canada (serveur d'exploration)

Increased motor cortical facilitation and decreased inhibition in Parkinson disease

Increased motor cortical facilitation and decreased inhibition in Parkinson disease

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki

	La maladie de Parkinson au Canada (serveur d'exploration)
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