Impaired Limb Proprioception in Adults With Spasmodic Dysphonia

Journal of Voice : Official Journal of the Voice Foundation
Jürgen KonczakPeter J Watson

Abstract

Focal dystonia of the head and neck are associated with a loss of kinesthetic acuity at muscles distant from the dystonic sites. That is, while the motor deficits in focal dystonia are confined, the associated somatosensory deficits are generalized. This is the first systematic study to examine, if patients diagnosed with spasmodic dystonia (SD) show somatosensory impairments similar in scope to other forms of focal dystonia. Proprioceptive acuity (ability to discriminate between two stimuli) for forearm position and motion sense was assessed in 14 spasmodic dystonia subjects and 28 age-matched controls using a passive motion apparatus. Psychophysical thresholds, uncertainty area (UA), and a proprioceptive acuity index (AI) were computed based on the subjects' verbal responses. The main findings are as follows: first, the SD group showed significantly elevated thresholds and UAs for forearm position sense compared with the control group. Second, 9 of 14 dystonia subjects (64%) exhibited an AI for position sense above the control group maximum. Three SD subjects had a motion sense AI above the control group maximum. The results indicate that impaired limb proprioception is a common feature of SD. Like other forms of focal dyston...Continue Reading

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Citations

Dec 1, 2019·Scientific Reports·Sanaz KhosravaniJürgen Konczak
Aug 7, 2018·Frontiers in Neurology·Laura AvanzinoAntonella Conte
Apr 2, 2019·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Sanaz KhosravaniJürgen Konczak

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