Various aspects of F-wave values in a healthy population

Various aspects of F-wave values in a healthy population

Author Nobrega, JAM Google Scholar
Pinheiro, D. S. Google Scholar
Manzano, G. M. Google Scholar
Kimura, J. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Kyoto Univ
Univ Iowa
Abstract Objective: To characterize various aspects of F-wave in a healthy population and establish normative data for future clinical use.Methods: A total of 100 healthy volunteers underwent sensory and motor nerve conduction studies of the ulnar and tibial nerves, including F waves elicited by 32 stimuli.Results: the F-wave measurements (mean +/- SD for ulnar vs tibial nerve) consisted of persistence (83 +/- 19 vs 97 +/- 5%), minimum, mean and maximum latencies (26.5 +/- 2.1, 28.1 +/- 2.2, and 30.4 +/- 2.3 vs 47.0 +/- 4.1, 49.6 +/- 4.4, and 52.5 +/- 4.4 ms), minimum, mean and maximum F-wave conduction velocities (FWCV) (55.0 +/- 2.7, 60.0 +/- 2.3, and 64.0 +/- 3.0 vs 49.0 +/- 2.9, 52.2 +/- 3.1, and 55.5 +/- 3.4 m/s), chronodispersion (3.9 +/- 0.9 vs 5.5 +/- 1.4 ms), mean amplitude (347 +/- 152 vs 384 +/- 148 muV) and mean duration (8.6 +/- 2.9 vs 13.0 +/- 4.5 ms). Additional measures, registered by electronic averaging, included latency (27.4 +/- 2.3 vs 48.6 +/- 4.7 ms), duration (9.6 +/- 2.2 vs 16.4 +/- 4.2 ms), and amplitude (299 +/- 156 vs 208 +/- 116 muV).Conclusions: the use of a height nomogram serves well as an acceptable means to adjust F latencies for the limb length. in addition to the commonly used minimal latency, maximal FWCV, and persistence, clinically relevant measures with a narrow variability includes mean and maximal latencies, chronodispersion, and mean duration. in particular, mean latency obtained with 10 stimuli gave accurate results either for group or individual analysis.Significance: the data help establish an adequate manner of recording F-wave latencies in clinical evaluation. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All fights reserved.
Keywords ulnar nerve
tibial nerve
F waves
nerve conduction studies
late responses
F-wave latency
F-wave velocity
Language English
Date 2004-10-01
Published in Clinical Neurophysiology. Clare: Elsevier Sci Ireland Ltd, v. 115, n. 10, p. 2336-2342, 2004.
ISSN 1388-2457 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 2336-2342
Origin http://dx.doi.org/10.1016/j.clinph.2004.05.011
Access rights Closed access
Type Article
Web of Science ID WOS:000224045000016
URI http://repositorio.unifesp.br/handle/11600/27962

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