[Clinical diagnosis of movement disorders--evoked potentials].
As a clinical diagnostic approach, the evoked potential has been used to differentiate movement disorders, especially myoclonic movements, Giant somatosensory evoked potentials (SEPs) and long-loop reflex to electrical stimulation of the peripheral nerve are commonly employed in the evaluation of patients with myoclonus. Recently, abnormality in a specific component of SEP frontal N30 has been reported in focal dystonia. Jerk locked back averaging has been applied to cortical reflex myoclonus, minipolymyoclonus, cortical tremor, simple tics, chorea-acanthocytosis, Huntington's chorea, etc. Silent period locked averaging is also used for asterixis. With these new electrophysiological techniques, evaluation of functional mechanisms in movement disorders may be expected, with fruitful results.
Terao
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Division of Neurology, Kawasaki Medical School.
Yasuda
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T
D003937:Diagnosis, Differential; D004558:Electric Stimulation; D005073:Evoked Potentials, Somatosensory; D006801:Humans; D008297:Male; D009069:Movement Disorders / Q000175:diagnosis*; D009207:Myoclonus / Q000175:diagnosis; D009482:Neurophysiology / Q000379:methods; D010525:Peripheral Nerves / Q000503:physiopathology; D012018:Reflex; D013981:Tic Disorders / Q000175:diagnosis