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KMID : 0352519850220030181
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Korea Univercity Medical Journal
1985 Volume.22 No. 3 p.181 ~ p.196
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A Study of cerebral somatosensory evoked potential with the stimulation of saphenous, superficial peroneal, sural nerve in healthy Korean
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Abstract
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A recording of cerebral somatosensory evoked potential(SEP) is possible by means of computer averaging by stimulation of peripheral sensory or mixed nerve. The cerebral SEP with the stimulation of the nerves of lower extremity is recorded at the Cz electroencephalographic recording site in the midline of the scalp and a complex wave form is recorded with an initial positive peak(PI) that is usually well defined and thought to represent the arrival of sensory impulses within the
thalamocorttcal system.
This study was conducted to measure the saphenous, superficial peroneal and sural nerves to determine the function of sensory component of L4, L5, S, roots and conduction in spinal cord pathway to provide basic data for clinical use in diagnosis and management of that function. Fifty adult healthy Koreans, 34 males and 16 females ranging from 20 to 59 years (36. 6 12. 08) of age were studies, with the latency of evoked response (Pi, Ni, P,, N2), the amplitude of Pi-NI, N,-P2, P2-N2 of each nerve were measured bilaterally.
The results were summarized as follows:
1. A total of 100 saphenous nerve was stimulated and the mean values of SEP latencies (P,, N2, P2, N2) were 37.791.98 msec, 46.99-2.61 msec, 57.90_3.49 msec and 73.375.89 msec respectively and the mean values of SEP amplitudes (Pi-NI, N,-P2, P2-N2) were 2.43 1.27 pV, 2.451.34 ltV and 2.401.16 pV respectively.
2. A total of 100 superficial peroneal nerve was stimulated and the mean values of SEP latencies(P,, N,, P2, N2) were 38.721.55 msec, 47.712.52 msec, 58.663.14 msec and 73. 654.85 msec respectively and the mean values of SEP amplitudes (PI-NI, NI-P2, P2-N2) were 2.320.98 feV, 2.251.10 pV and 2.191.16 uV respectively.
3. A total of 100 sural nerves was stimulated and the mean values of SEP latencies(P,,
Ni, Pz, Nz) were 38.272.04 msec, 47.032.77 cosec, 58.503.79 msec and 73.84.80 msec respectively and the mean values of SEP amplitudes(Pi-Nl, N1-P2, P2-N2) were 2.341.04 ,pV, 2.471,05 V and 2.22=0.91 pV respectively.
4. No statistical variation was noted with advancing age in latenc and amplitude in SEP with each nerve stimulation.
5. There were no significant differences of latency and amplitude related to the dominance of extremities in SEP with each nerve stimulation.
6. There were no significant differences of latency and amplitude related to sex in SEP with each nerve stimulation.
. 7. No statistical variation was noted in increasing height in latency in SEP with each nerve stimulation.
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