Myo-axonal ephaptic responses and their F waves in case of chronic denervation

Electroencephalography and Clinical Neurophysiology
G Roth

Abstract

Twenty-two ephaptic responses (ERs) were observed in chronically denervated muscles. The ER is a late potential, either evoked by every stimulus or inconstant, with most often an unstable latency. ERs are not artefacts since they are recorded with surface electrodes and again some days later. The ER seems to result from the ephaptic excitation of an axon by the synchronized late potential (LP) of a contiguous reinnervated motor unit. Both the ER and the LP present the same latency and excitability. Some ERs disappear in the presence of the direct response of the post-ephaptic axon or when applying a second stimulus. Ten ERs were accompanied by F waves. The origin of F1 was on the post-ephaptic axon, at the stimulation site. F1 never followed the ER, being cancelled by its antidromic wave. The pre-ephaptic origin of F2 was at the stimulation site. Its recurrent wave reached the post-ephaptic axon through the ephapse. The origin of the antidromic wave of F3 was on the post-ephaptic axon at the site of the ephapse. F3 followed the ER with a constant interval regardless of the stimulation site, and its latency increased with more proximal stimulation.

References

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Citations

Jul 13, 2002·Muscle & Nerve. Supplement·Christian Bischoff
Jun 19, 2010·Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology·Ferdinando SartucciAlessandro Rossi
Feb 1, 1994·Electroencephalography and Clinical Neurophysiology·G Roth
Sep 25, 2018·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Liborio RampelloAntonio Arcidiacono
Aug 23, 2017·Brain and Behavior·Iva SrotovaJosef Bednarik
May 1, 1997·Muscle & Nerve·J Finsterer, B Mamoli
Mar 23, 1999·Muscle & Nerve·M E KornhuberB Conrad
Aug 19, 2020·Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology·Liborio RampelloFrancesco Patti

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