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[Dyskinesia in metabolic encephalopathy]
1Department of Neurology, School of Medicine, University of Tokyo.
Nihon Rinsho. Japanese Journal of Clinical Medicine
|November 1, 1993
Summary
Involuntary movements in metabolic encephalopathies are linked to slowed brain activity and consciousness loss. Specific movements like asterixis, myoclonus, and tremor have distinct electromyographic (EMG) patterns.
Area of Science:
- Neurology
- Metabolic Disorders
- Clinical Neurophysiology
Background:
- Metabolic encephalopathies present with diverse neurological symptoms.
- Involuntary movements are common manifestations, often accompanying altered consciousness and electroencephalographic (EEG) changes.
Purpose of the Study:
- To describe various involuntary movements observed in metabolic encephalopathies.
- To correlate these movements with specific electromyographic (EMG) findings.
- To briefly outline clinical features of common metabolic encephalopathies.
Main Methods:
- Observational description of involuntary movements.
- Electromyography (EMG) analysis to characterize movement patterns.
- Review of clinical features in hepatic, uremic, hypoxic, and hypoglycemic encephalopathies.
Main Results:
- Asterixis is characterized by EMG silence during voluntary contraction.
- Myoclonus is associated with brief, excessive EMG discharges.
- Tremor results from grouped EMG discharges.
- These movements often coincide with slowed EEG activity and reduced consciousness.
Conclusions:
- Distinct EMG patterns differentiate involuntary movements in metabolic encephalopathies.
- Understanding these movement characteristics aids in diagnosing specific encephalopathic causes.
- Clinical features of hepatic, uremic, hypoxic, and hypoglycemic encephalopathies are varied but share common movement disorders.