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Somatosensory evoked potentials in spinal cord diseases
Neurologie Et Psychiatrie
|July 1, 1989
Summary
Somatosensory evoked potentials (SEPs) are highly sensitive for detecting spinal cord diseases, with tibial nerve stimulation and cortical recording showing 95% abnormality rates. This diagnostic tool aids in identifying various neurological conditions affecting the spinal cord.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
Background:
- Spinal cord diseases encompass a range of conditions affecting neurological function.
- Accurate diagnosis of spinal cord pathologies is crucial for effective management.
Purpose of the Study:
- To evaluate the diagnostic utility of somatosensory evoked potentials (SEPs) in patients with diverse spinal cord diseases.
- To determine the most sensitive SEP recording parameters for detecting spinal cord abnormalities.
Main Methods:
- SEPs were recorded in 115 patients with various spinal cord diseases, including multiple sclerosis, ALS, myelopathy, and spinal cord injury.
- Recordings were taken at parietal, spinal (cervical/lumbar), and Erb's point.
- Central conduction time was calculated using specific potential intervals (N9-N13, LP-P37).
Main Results:
- Cortical SEPs following tibial nerve stimulation demonstrated 95% abnormality, identifying delayed or absent potentials.
- Abnormalities in cervical potential N13 were found in 96% of multiple sclerosis patients.
- SEP abnormalities were consistently observed across various spinal cord diseases, including myelopathy and inflammatory conditions.
Conclusions:
- Tibial nerve stimulation with cortical SEP recording is a highly sensitive method for diagnosing spinal cord diseases.
- SEP analysis, particularly central conduction time, provides valuable insights into the location and extent of spinal cord dysfunction.
- SEPs serve as a critical electrophysiological tool for the comprehensive evaluation of spinal cord pathologies.