Detailed analysis of the latencies of median nerve somatosensory evoked potential components, 1: selection of the best standard parameters and the establishment of normal values
| Autor: | Toru Mannen, Masahito Kobayashi, Teruo Shimizu, Masahiro Sonoo, Kieko Genba-Shimizu |
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| Rok vydání: | 1996 |
| Předmět: |
Adult
Male medicine.medical_specialty Audiology Somatosensory system Functional Laterality Reference Values Evoked Potentials Somatosensory Linear regression medicine Reaction Time Humans Lead (electronics) Aged Aged 80 and over General Neuroscience Regression analysis Nomogram Middle Aged Reference Standards Median nerve Surgery Median Nerve Standard electrode potential Somatosensory evoked potential Regression Analysis Female Neurology (clinical) Psychology |
| Zdroj: | Electroencephalography and clinical neurophysiology. 100(4) |
| ISSN: | 0013-4694 |
| Popis: | In order to objectively select the standard parameters best suited for the evaluation of somatosensory conduction in median nerve somatosensory evoked potentials (SEP), we performed a detailed statistical analysis of intersubject variability for the latencies of SEP components based on the recordings of 62 normal subjects. Multiple regression analyses for height, age, (age--20)2 and sex were performed for the latencies of 13 components and 78 intercomponent intervals, and the residual variance was used as an indicator of the stability of each parameter. As a result, N9 onset in EPi-NC lead, N11' onset in C6S-Fz lead, P13/14 onset in scalp-NC leads, for which N13' onset recorded in C6S-Fz lead may substitute, and N20 onset in CPc-Fz lead were the most stable time-points selected as standards. N11 onset in C6S-NC, which other authors have recommended as the standard point representing spinal entry, was not recorded consistently, and P11 onset in scalp-NC leads was also unstable. N20 peak and N13'-N20 interval (equivalent to conventional central conduction time) were extremely unstable. We presented the nomograms to find normal limits of the standard parameters corresponding to the given values of the predictor variables (height, age or sex). As the standard recording montage in routine clinical examinations, we recommended a simple method using Fz reference, for example (1) EPi-Fz, (2) C6S-Fz, (3) CPc-Fz, because this montage is sufficient to measure the stable standard parameters. |
| Databáze: | OpenAIRE |
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