Which involuntary movements may be present during neurologic assessment for electrodiagnostic medicine?

Updated: Aug 06, 2019
  • Author: Brian M Kelly, DO; Chief Editor: Stephen Kishner, MD, MHA  more...
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Fasciculations seen clinically, as opposed to those seen during EMG, are abnormal movements of groups of single muscle fibers (ie, fascicles, muscle bundles); the movements are powerful enough to be visible within a muscle but usually are not great enough to move a joint. These fasciculations may be seen in individuals without abnormalities, but, when associated with atrophy, they typically indicate abnormalities in the LMN pathway.

Tremors can be seen in various disorders of the brain, such as the fine, pill-rolling, resting tremor in Parkinson disease. Intention tremors can be seen in cerebellar diseases and postural tremors can indicate various conditions, such as anxiety or metabolic disturbances. For example, a fine, rapid tremor can be seen in hyperthyroidism, while the flapping tremor of Asterixis can occur in liver, renal, or pulmonary failure.

Choreiform or athetoid movements are seen in brain disorders.

Dystonias can be focal (eg, writer's cramp) or more generalized, such as that seen in torticollis. [18]

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