Spontaneous and evoked ectopic discharges recorded from single human axons.

Abstract:

:A quantitative assessment was made of the firing characteristics of repetitive axonal discharges encountered during microneurographic recordings from human peripheral nerves. Spontaneous activity was recorded from 16 single axons using tungsten microelectrodes inserted percutaneously into fascicles of the median or peroneal nerves in normal subjects. These discharges typically consisted of brief bursts of 2-5 spikes occurring at a frequency of 7-10 Hz. Peak instantaneous frequencies usually exceeded 300 Hz. Based on their similarity with spontaneous high-frequency discharges recorded from single axons following nerve damage, ischemia, prolonged electrical stimulation, or hyperventilation, it is concluded that they are generated ectopically at the site of a previous impalement of a nerve fiber. It is suggested that short-term damage to the nerve fiber caused by the microelectrode may allow accumulation of K+ underneath the myelin, triggering an inward flow of K+ and regenerative depolarizations. Alternatively, internodal channels may be exposed following damage to the myelin, resulting in the generation of spontaneous pacemaker potentials and repetitive discharges.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Macefield VG

doi

10.1002/(sici)1097-4598(199804)21:4<461::aid-mus4>

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

461-8

issue

4

eissn

0148-639X

issn

1097-4598

pii

10.1002/(SICI)1097-4598(199804)21:4<461::AID-MUS4>

journal_volume

21

pub_type

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