PRIMARY WRITING TREMOR - A FORM OF FOCAL DYSTONIA

被引：56

作者：

ELBLE, RJ

MOODY, C

HIGGINS, C

机构：

[1] Department of Medicine, Division of Neurology, Southern Illinois University School of Medicine, Springfield, Illinois

来源：

MOVEMENT DISORDERS | 1990年 / 5卷 / 02期

关键词：

Dystonia; Electromyography; Primary writing tremor; Tremor; Writer's cramp;

D O I：

10.1002/mds.870050205

中图分类号：

R74 [神经病学与精神病学];

学科分类号：

摘要：

Five patients exhibited severe tremor in the upper extremity, primarily when attempting to write or draw. Electromyography was performed to determine the patterns of muscle activity that were responsible for this tremor. Tremor was measured with an accelerometer and with a digitizing tablet. Two patients had postural tremor that was indistinguishable from mild, high‐frequency essential tremor. All patients exhibited a severe 5–7‐Hz tremor during the acts of writing and drawing. Muscles throughout the affected extremity exhibited rhythmic 5–7‐Hz bursts of motor unit discharge, and the average level of motor unit activity was tonically increased in antagonistic muscles. This abnormal coactivation of antagonistic muscles produced subtle dystonic posturing of the affected limb that was overshadowed by severe tremor. Electromyography was useful in confirming the coexistence of tremor and dystonia in our patients. The nonspecificity of dystonia and postural tremor must be considered when discussing the nosology and pathophysiology of primary writing tremor. Copyright © 1990 Movement Disorder Society

引用

页码：118 / 126

页数：9

共 24 条

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