Somatosensory evoked potentials in diagnostics of cervical spondylosis and herniated disc

Siivola, J.; Sulg, I; Heiskari, M.

doi:10.1016/0013-4694(81)90056-0

Cited by 32 publications

(4 citation statements)

References 23 publications

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“…An abnormal SEP associated with a normal SN A excellent evidence for sensory root dysfunction, assuming tha the central nervous system is normal. However, in som radiculopathies such as herpes zoster (Thomas and Howerd 1974), and some types of diabetic radiculopathy (Asbury, 1977 Sun andStreib, 1981) in which loss or destruction of dorsal roo ganglion cells occur, both the SEP and SNAP will be abnormal These are true ganglionopathies. Cutaneous stimulation excites the slower conducting group cutaneous afferents as opposed to the faster conducting muscle afferents activated by mixed nerve stimulation.…”

Section: Number Of Patientsmentioning

confidence: 99%

Evaluation of Radiculopathies by Segmental Stimulation and Somatosensory Evoked Potentials

Eisen

Hoirch

Moll

1983

Can. j. neurol. sci.

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SUMMARY:Thirty-six patients with suspected or myelographically proven radiculopathies were investigated with motor and sensory conductions, F-waves, needle electromyography, and somatosensory evoked potentials (SEPs). SEPs were elicited by cutaneous nerve stimulation representative of input from individual cervical and lumbosacral dorsal roots. A myelographic defect was present in 83% of 30 patients who had myelograms. Overall 78% of patients had one or more abnormal electrophysiologic tests, the needle EMG giving the best diagnostic yield (75%). F-waves and SEPs were abnormal in 43% and 57% of cases respectively. Motor deficit correlated best with abnormal EMGs, whilst abnormal SEPs occurred most frequently when sensory deficit predominated. Prolonged latency of the SEP occurred rarely, reduced amplitude or abnormal morphology being the most useful characteristics. SEPs evoked by cutaneous nerve stimulation are a useful addition to conventionally available electrophysiological methods of evaluating radiculopathies, especially in the absence of motor deficit.

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Section: Number Of Patientsmentioning

confidence: 99%

Evaluation of Radiculopathies by Segmental Stimulation and Somatosensory Evoked Potentials

Eisen

Hoirch

Moll

1983

Can. j. neurol. sci.

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“…Patients who have pain and paresthesiae, with no objective neurological signs, frequently have normal responses, while those with a more severe spondylotic radiculopathy causing objective neurological signs may have abnormal SEPs, with delayed or lost components," regardless of whether a myelopathy is also present.2'3*27 Some authors emphasize that amplitude rather than latency of the responses reflects nerve lesions caused by spondylotic deformities. 55 In general, however, the nature of'the SEP abnormality does not help in indicating either the severity of the neurological disorder or the long-term prognosis, and in some patients with a spondylotic myelopath the SEP findings may be entirely normal.ns~22; Thus, the SEP is no better than a careful clinical examination in determining the severity and prognosis of cervical spondylosis. It is of no help in the selection of patients for surgery, and such decisions should be made on clinical grounds.…”

Section: Cervical Spondvlosismentioning

confidence: 99%

The clinical role of somatosensory evoked potential studies: A critical appraisal

Aminoff

1984

Muscle and Nerve

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The clinical utility and limitations of somatosensory evoked potential (SEP) studies are reviewed. Somatosensory evoked potentials may help to identify a lesion in the sensory pathways, but do not indicate its nature. In multiple sclerosis subjects, the SEP findings may help to establish that there is a multiplicity of lesions, but multimodality evoked potential abnormalities may occur in other disorders. Somatosensory evoked potential abnormalities do not reflect either the severity or the prognosis of cervical spondylosis and do not reliably permit early recognition of the totality of traumatic cord lesions, while the role of SEPs in monitoring cord function intraoperatively awaits definition. Somatosensory evoked potentials do not reliably indicate the individual prognosis after severe head injury, and discrepancies in published findings suggest that their use in the evaluation of brain death is premature. In hereditary spinocerebellar degenerations, SEP abnormalities may reflect central or peripheral pathology. Somatosensory evoked potentials can be used to determine conduction velocity in peripheral nerves and to identify inaccessible proximal lesions of these nerves, but the findings may lead to misleading conclusions about brachial plexus lesions, especially if pre- and postganglionic lesions coexist.

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“…Short-latency components of the somatosensory evoked potentials (SEPs) to médian nerve stimula tion have increasing uses in clinical diagnosis (Desmedt 1971;Desmedt 1975, 1980;Colon et al 1978;Cant 1978, 1981;Kimura et al 1978;El Negamy and Sedgwick 1979;Jones 1979;Anziska and Cracco 1980;Chiappa et al 1980;Mauguière and Courjon 1981;Siivola et al 1981;Chiappa and R opper 1982;Eisen 1982;Mauguière et al 1983). Current ad vances rely on better differentiation of standard SEP components and their generators.…”

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confidence: 99%

Neural generators of N18 and P14 far-field somatosensory evoked potentials studied in patients with lesion of thalamus or thalamo-cortical radiations

Mauguı̀ere

Desmedt

Courjon

1983

Electroencephalography and Clinical Neurophysiology

200

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Somatosensory evoked potentials (SEPs) to electrical stimulation of the right or left median nerve were studied in 4 patients with hemianesthesia and a severe thalamic or suprathalamic vascular lesion on one side. The SEPs were recorded with a non-cephalic reference. The normal side of each patient served as his or her own control. The lesion consistently abolished the parietal N20-P27-P45 and the prerolandic P22-N30 SEP components. It did not significantly affect the P9-P11-P14 positive far fields, nor the widespread bilateral N18 SEP component. This allowed N18 features to be studied without interference from cortical components. It is proposed that N18 reflects several deeply located generators in brain stem and/or thalamus whereas N20 represents the earliest cortical response of the contralateral post-central receiving areas.

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Somatosensory evoked potentials in diagnostics of cervical spondylosis and herniated disc

Cited by 32 publications

References 23 publications

Evaluation of Radiculopathies by Segmental Stimulation and Somatosensory Evoked Potentials

Evaluation of Radiculopathies by Segmental Stimulation and Somatosensory Evoked Potentials

The clinical role of somatosensory evoked potential studies: A critical appraisal

Neural generators of N18 and P14 far-field somatosensory evoked potentials studied in patients with lesion of thalamus or thalamo-cortical radiations

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