Journal article
Effects of stimulus intensity on latency and conduction time of short-latency somatosensory evoked potentials
Clinical EEG electroencephalography, Vol.32(2), pp.75-81
04/2001
DOI: 10.1177/155005940103200206
PMID: 11360724
Abstract
We studied the effect of stimulus intensity on latencies of short-latency somatosensory evoked potentials (SSEP) by measuring both onset and peak latencies individually. The latencies of N9, N13, N20 and N9-N13 peripheral conduction time (PCT) of median nerve (MN) SSEP, and N8, N23, P37 and N8-N23 PCT of tibial nerve (TN) and sural nerve (SN) SSEP significantly shortened with increasing stimulus intensity by onset latency measurement. However, those latencies by peak latency measurement were less significantly shortened or had only a trend of latency shortening without statistical significance. In contrast to PCT, N13-N20 central conduction time (CCT) of MN-SSEP and N23-P37 CCT of TN- or SN-SSEP showed no latency changes with the increased stimulus intensity by both onset and peak latencies measurement. As peak latencies had greater interindividual variability than onset latencies shown by larger standard deviation, shortening of onset latencies were more consistent than that of peak latencies. We think shortening of onset latencies indicates the recruitment of faster conduction fiber along with increased stimulus intensity. As the degree of latency shortening was less if stimulus intensity was above 2.5 times sensory threshold, the stimulus intensity greater than 2.5 times the sensory threshold should be used for clinical application.
Details
- Title: Subtitle
- Effects of stimulus intensity on latency and conduction time of short-latency somatosensory evoked potentials
- Creators
- Y Shiga - Division of Clinical Electrophysiology, Department of Neurology, University of Iowa, College of Medicine, 200 Hawkins Dr. Iowa City, Iowa, USAT YamadaA OfujiY FujitaT KawamuraK InoueY HadaH YamazakiM H ChengM H Yeh
- Resource Type
- Journal article
- Publication Details
- Clinical EEG electroencephalography, Vol.32(2), pp.75-81
- Publisher
- United States
- DOI
- 10.1177/155005940103200206
- PMID
- 11360724
- ISSN
- 0009-9155
- eISSN
- 2169-5202
- Language
- English
- Date published
- 04/2001
- Academic Unit
- Neurology
- Record Identifier
- 9984020997402771
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