Lack of inhibitory interaction between somatosensory afferent inputs and intracortical inhibitory interneurons in focal hand dystonia

Movement Disorders : Official Journal of the Movement Disorder Society
Marion Simonetta-MoreauS Meunier

Abstract

We looked for an impaired interaction in the primary motor cortex between intracortical inhibitory circuits and circuits fed by somatosensory inputs in patients with writer's cramp. Short-interval intracortical inhibition (sICI) to wrist extensor carpi radialis muscle (ECR) was conditioned by stimulation of antagonist muscle afferents and sICI to first dorsal interosseus (FDI) muscle by homotopic cutaneous afferents stimulation. sICI was assessed at rest and during a tonic contraction of the target muscle. Eighteen patients with writer's cramp (10 having a wrist dystonic posture in flexion during writing and 8 in extension) were compared to 14 control subjects. Peripheral inputs decreased sICI in control subjects. This decrease was lost in patients in both FDI and ECR, regardless of the wrist dystonic posture. By contrast, contraction-induced depression of sICI appeared dependant on the dystonic status of the muscle: depression of sICI to ECR was abolished in patients with wrist dystonic posture in flexion, but not in patients with dystonic posture in extension, sICI even giving way to motor-evoked potential facilitation. Loss of interaction between interneurons mediating sICI and peripheral inputs probably belongs to the initi...Continue Reading

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Aug 2, 2011·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Rebecca DolbergSrikantan S Nagarajan
Sep 8, 2010·Neurobiology of Disease·Mark Hallett
Apr 25, 2009·Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists·Alison L McKenzieNancy Byl
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Feb 12, 2008·Movement Disorders : Official Journal of the Movement Disorder Society·UNKNOWN Sabine MeunierUNKNOWN Marie Vidailhet
Dec 7, 2007·Muscle & Nerve·Sarah Pirio RichardsonMark Hallett
Sep 30, 2020·The European Journal of Neuroscience·Alana B McCambridge, Lynley V Bradnam

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