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Estimation of cervical cord dysfunction by somatosensory evoked potentials
1Department of Orthopaedic Surgery, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyoku, Kyoto, 602-8566 Japan. rinda_12@d2.dion.ne.jp
Muscle & Nerve
|September 26, 2000
Summary
Short-latency somatosensory evoked potentials (SSEPs) can help assess cervical myelopathy. Specific SSEP measurements correlate with clinical symptoms, aiding in lesion localization and functional assessment.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
Background:
- Cervical myelopathy presents diagnostic challenges.
- Short-latency somatosensory evoked potentials (SSEPs) are used to assess spinal cord function.
- Non-cephalic reference montages are employed for SSEP recordings.
Purpose of the Study:
- To investigate the relationship between abnormal SSEPs and clinical variables in cervical myelopathy.
- To evaluate the diagnostic utility of SSEPs in cervical myelopathy patients.
- To explore the segmental localization value of SSEPs.
Main Methods:
- Cervical SSEPs were recorded from 87 patients by stimulating median and ulnar nerves.
- A noncephalic reference montage was utilized.
- A grading classification for spinal N13 based on latency and amplitude was developed.
Main Results:
- The N13 grade classification showed good correlation with clinical variables.
- N13 grading aids in segmental localization of cervical lesions.
- N9-P14 interpeak latency from ulnar nerve stimulation correlated significantly with lower extremity function (r = -0.440, P <0.0001).
Conclusions:
- SSEPs, particularly the N13 component, are valuable for assessing cervical myelopathy.
- Combined assessment of N13 amplitude and N9-N13/N9-P14 latencies can differentiate dorsal column and dorsal horn function.
- SSEPs offer diagnostic utility and aid in understanding functional deficits in cervical myelopathy.