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Electrodiagnostic and nerve ultrasonographic features in upper limb spasticity: an observational study
Functional Neurology
|October 19, 2017
Summary
Stroke-induced spasticity alters peripheral nerves. This study found electrodiagnostic and nerve ultrasound differences in affected limbs, suggesting lower motor neuron changes contribute to these nerve abnormalities.
Area of Science:
- Neuroscience
- Neurology
- Peripheral Nerve Disorders
Background:
- Spasticity is a common motor disorder following stroke.
- The impact of spasticity on peripheral nerve structure and function is not fully understood.
Purpose of the Study:
- To investigate the electrodiagnostic and ultrasonographic characteristics of median and ulnar nerves in adults with upper limb spasticity post-stroke.
- To compare nerve features between affected and unaffected upper limbs.
Main Methods:
- Nerve conduction studies and ultrasound were performed on median and ulnar nerves in both upper limbs of 20 chronic stroke patients with hemiparesis.
- Comparative analysis between affected and unaffected limbs was conducted.
Main Results:
- Significant differences were observed in distal motor latencies, compound muscle action potentials, and F-wave latencies for both median and ulnar nerves between affected and unaffected limbs.
- The median nerve exhibited a significantly larger cross-sectional area at the elbow in the affected limb compared to the unaffected limb.
Conclusions:
- Stroke-related spasticity leads to electrodiagnostic asymmetries and nerve ultrasonographic abnormalities in the upper limbs.
- Subtle alterations in lower motor neuron activity and spasticity may underlie these observed nerve changes.
