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. 2012 May;51(5):286-91.
doi: 10.3340/jkns.2012.51.5.286. Epub 2012 May 31.

Changes in Dermatomal Somatosensory Evoked Potentials according to Stimulation Intensity and Severity of Carpal Tunnel Syndrome

Soo-Youn Sohn  1 , Jeong-Hwan Seo, Yong Min, Min-Ho Seo, Jong-Pil Eun, Kyung-Jin Song
Affiliations

Changes in Dermatomal Somatosensory Evoked Potentials according to Stimulation Intensity and Severity of Carpal Tunnel Syndrome

Soo-Youn Sohn et al. J Korean Neurosurg Soc. 2012 May.

Abstract

Objective: To investigate the change of latency of cervical dermatomal somatosensory evoked potential (DSEP) according to stimulation intensity (SI) and severity of carpal tunnel syndrome (CTS).

Methods: Stimulation sites were the C6, C7, and C8 dermatomal areas. Two stimulation intensities 1.5×sensory threshold (ST) and 2.5×ST were used on both normal and CTS patients.

Results: In moderate CTS, the latencies of C6 and C7 DSEP during 1.5×ST SI and those of C7 DSEP during 2.5×ST SI were significantly delayed compared with the values of normal subjects. Significant correlation between the latency of C7 DSEP of 2.5×ST stimulation and the median sensory nerve conduction velocity was observed.

Conclusion: We suggest that these data can aid in the diagnosis of cervical sensory radiculopathy using low stimulation intensity and of those who have cervical sensory radiculopathy combined with CTS patients.

Keywords: Carpal tunnel syndrome; Dermatomal somatosensory evoked potential; Sensory radiculopathy; Stimulation intensity; Stimulation threshold.

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Figures

Fig. 1
Fig. 1
Significant correlation is noted between latency of C7 DSEP and sensory nerve conduction velocity (NCV) in CTS patients, (A) in total CTS patients, (B) in moderate CTS patients, during 2.5×sensory threshold intensity. r2 : Correlation coefficient, p : p-value. DSEP : dermatomal somatosensory evoked potential, CTS : carpal tunnel syndrome.
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