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pubmed-article:1582054pubmed:abstractTextRelationships between stimulus intensity and peak latencies and amplitudes in posterior tibial nerve somatosensory evoked potential patterns were evaluated in ten healthy subjects. Eight intermediate latency peaks between 30 and 125 milliseconds (ms) after stimulus onset and seven amplitudes were analyzed. In general, there was a decrease in latency with each increase in stimulus intensity over a five step intensity range between 5 and 19 milliamps (mA) for most peaks. Similarly, increases in amplitudes generally occurred with increases in stimulus intensity for most peaks. Later peaks N105 and P115 as well as amplitudes P90-N105 and N105-P115 were least sensitive to stimulus intensity changes. The greatest changes in peak latency and amplitude occurred as stimulus intensity was increased from 7 to 11 mA. Beyond 11 mA relatively little change was observed in either peak latencies or amplitudes. Under anesthesia, by contrast, there was no stimulus intensity-peak latency interaction and beyond 11 mA there were decreases in amplitudes. Possible reasons for these findings are discussed.lld:pubmed
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pubmed-article:1582054pubmed:dateRevised2004-11-17lld:pubmed
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pubmed-article:1582054pubmed:year1992lld:pubmed
pubmed-article:1582054pubmed:articleTitleEffects of stimulus intensity on posterior tibial nerve somatosensory evoked potentials.lld:pubmed
pubmed-article:1582054pubmed:affiliationU.C. Brain Function Study Unit, Agnews Developmental Center, San Jose, CA 95134.lld:pubmed
pubmed-article:1582054pubmed:publicationTypeJournal Articlelld:pubmed