k tibial nerve stimulation: Normative values |
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| Affiliation: | 1. Multiple Sclerosis Centre, Binaghi Hospital, ATS Sardegna, Cagliari, Italy;2. Multiple Sclerosis Centre, Binaghi Hospital, Department of Medical Sciences and Public Health, University of Cagliari, Italy;3. Radiology Unit, Binaghi Hospital, ATS Sardegna, Cagliari, Italy;1. Dept. of Neurology, Albany Medical College, Albany, NY, USA;2. Neural Injury and Repair, Wadsworth Center, New York State Dept. of Health, Albany, NY, USA;3. Early Brain Injury and Motor Recovery Lab, Burke-Cornell Medical Research Institute, White Plains, NY, USA;4. Translational Neurological Research Laboratory, Helen Hayes Hospital, West Haverstraw, NY, USA;5. Dept. of Neurosurgery, Albany Medical Center, Albany, NY, USA;6. Dept. of Neurosurgery, Washington University, St. Louis, MO, USA;7. Dept. of Biomed. Eng., Rensselaer Polytechnic Institute, Troy, NY, USA;8. Dept. of Biomed. Sci., State Univ. of New York at Albany, Albany, NY, USA;9. Dept. of Elec. and Comp. Eng., Univ. of Texas at El Paso, El Paso, TX, USA |
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| Abstract: | Cortical somatosensory evoked potentials to posterior tibial nerve stimulation were obtained in 29 normal controls varying in age and body height. In obtaining these potentials we varied recording derivations and frequency settings. Our recordings demonstrated the following points: - 1.(1) N20 (dorsal cord potential) and the early cortical components (P2, N2) were the only potentials that were consistently recorded. All other subcortical components (N18, N24, P27, N30) were of relatively low amplitude and not infrequently absent even in normals.
- 2.(2) All absolute latencies other than N2 were correlated with body height. However, interpeak latency differences were independent of body height.
- 3.(3) Below the age of 20, subcortical but not cortical peak latencies correlated with age, but this appeared to be due to changes in body height in this age group.
- 4.(4) Absolute amplitudes and amplitude ratios (left/right and uni/bilateral) showed marked interindividual variability and have very limited value in defining abnormality.
- 5.(5) The use of restricted filter windows facilitated the selective recording of postsynaptic potentials (30–250 Hz) and action potentials (150–1500 Hz).
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