Chapter

Introduction

Jay A. Liveson and Dong M. Ma

in Laboratory Reference for Clinical Neurophysiology

Published in print May 1999 | ISBN: 9780195129243
Published online March 2012 | e-ISBN: 9780199847792 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195129243.003.0001
Introduction

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The study of the conduction of nerves entails depolarizing the fibers with a stimulus, followed by monitoring the evoked response. Direct recording can be made along sensory or mixed nerves. Indirect recording from a muscle is used for motor studies. Both orthodromic and antidromic studies are available as propagation occurs both proximally and distally from the point of stimulation. Sensory territories are shown in this chapter. Polyneuropathy is diagnosed electrophysiologically by abnormalities in multiple nerves. The pattern is usually diffuse and symmetrical. Less often it is patchy, with severely involved and adjacent relatively spared nerves — a distribution most appropriately described clinically as mononeuritis multiplex. Multiple nerve “entrapments” may occur, sometimes superimposed over a diffuse polyneuropathy. Because of these possibilities, multiple nerves should always be examined, including clinically normal nerves.

Keywords: conduction; nerves; direct recording; indirect recording; polyneuropathy; mononeuritis multiplex

Chapter.  4311 words.  Illustrated.

Subjects: Neuroscience

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