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Sequence of electromyographic abnormalities in stroke syndrome
Archives of Physical Medicine and Rehabilitation
|November 1, 1975
Summary
Early electromyography in stroke patients revealed abnormal muscle irritability within days, resolving as motor function returned. This suggests a loss of neurotrophic influence on muscle fibers post-stroke.
Area of Science:
- Neuroscience
- Neurology
- Muscle Physiology
Background:
- Stroke can lead to significant motor deficits and muscle changes.
- Electromyography (EMG) is crucial for assessing peripheral nerve and muscle disorders.
Purpose of the Study:
- To investigate the temporal sequence of electromyography findings in stroke patients.
- To explore the relationship between early muscle irritability and the recovery of volitional control and spasticity.
Main Methods:
- Repeated electromyography examinations were performed on 20 stroke patients.
- Muscle electrical activity, including fibrillation potentials, positive waves, volitional potentials, and spasticity, was monitored over time.
Main Results:
- Fibrillation potentials and positive waves appeared 7-10 days post-stroke.
- These early abnormal potentials resolved as volitional potentials and spasticity emerged.
- This sequence was observed first in antigravity muscles, then antagonists, and finally distal muscles.
Conclusions:
- The observed sequence suggests a pattern of denervation and reinnervation following stroke.
- Hypothesizes that abnormal muscle irritability results from a loss of neurotrophic support to muscle fibers after stroke.