Journal article
Stationary potentials after median nerve stimulation: changes with arm position
Electroencephalography and clinical neurophysiology, Vol.71(5), pp.348-356
09/1988
DOI: 10.1016/0168-5597(88)90037-8
PMID: 2457486
Abstract
We previously reported the presence of stationary negative potentials (N3, N6, N9) over the arm ipsilateral to the side of median nerve stimulation. In this study, we examined the effect of different arm positions upon these stationary peaks in 12 normal subjects. When arm position was changed from elbow extended to elbow flexed 90 degrees, we recorded a new negative peak, N4. The peak latency of N4 corresponded to the traveling impulse reaching the distal biceps brachii. With the elbow flexed, N3, N6 and N9 peak latencies significantly shortened compared to those recorded with the arm in the usual elbow extended position. In contrast, with the arm abducted at the shoulder, N6 and N9 latencies were significantly prolonged while N3 remained unchanged. Corresponding latency shifts were also observed in the bipolarly recorded traveling impulse. We consider 2 possible factors for N4 enhancement by elbow flexion. One is the change in conducting volume surrounding the nerve, i.e., increased muscle bulk of biceps brachii. The other is the change in axial orientation of the propagating nerve impulse by 90 degrees. We also propose that the latency shifts of the stationary potential as well as of a traveling wave can be attributed primarily to relaxation or stretching of the nerve trunk with change in arm position.
Details
- Title: Subtitle
- Stationary potentials after median nerve stimulation: changes with arm position
- Creators
- S Kameyama - Department of Neurology, University of Iowa Hospital, Iowa City 52242T YamadaH MatsuokaY FuchigamiY NakazumiC SuhJ Kimura
- Resource Type
- Journal article
- Publication Details
- Electroencephalography and clinical neurophysiology, Vol.71(5), pp.348-356
- Publisher
- Ireland
- DOI
- 10.1016/0168-5597(88)90037-8
- PMID
- 2457486
- ISSN
- 0013-4694
- eISSN
- 1872-6380
- Language
- English
- Date published
- 09/1988
- Academic Unit
- Neurology
- Record Identifier
- 9984020736802771
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