Abnormal single motor unit behavior in the upper motor neuron syndrome
| Autor: | Bhagwan T. Shahani, Stephen W. Parker, M. Margaret Wierzbicka |
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| Rok vydání: | 1991 |
| Předmět: |
Physiology
Neural Conduction Upper motor neuron lesion Electromyography Hyperreflexia Lesion Cellular and Molecular Neuroscience Physiology (medical) medicine Humans Spasticity Motor Neurons medicine.diagnostic_test business.industry Muscles Leukoencephalopathy Progressive Multifocal Anatomy Neuromuscular Diseases Middle Aged Magnetic Resonance Imaging Motor unit Upper motor neuron syndrome Arm Female Neurology (clinical) medicine.symptom business Clasp-knife response |
| Zdroj: | Musclenerve. 14(1) |
| ISSN: | 0148-639X |
| Popis: | We studied the discharge pattern of single motor units (SMUs) in the left and right biceps muscles from a patient with nonspastic weakness of the left arm. Detailed statistical analysis of the behavior of discharge patterns of 4 of 4 single motor units on the affected side showed abnormalities with characteristic features of an upper motor neuron lesion. Five out of 5 single motor units recorded from the right biceps were normal. An upper motor neuron lesion affecting the left arm, predicted by our results, was confirmed by magnetic resonance imaging (MRI), which showed a lesion in the right precentral gyrus. It appears that changes in single motor unit firing characteristics, caused by an upper motor neuron lesion, can be detected at a time when there is no evidence of increased "tone" and/or hyperreflexia (spasticity) in the affected extremity. |
| Databáze: | OpenAIRE |
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