Show Summary Details
Page of

Types of Electromyographic Abnormalities 

Types of Electromyographic Abnormalities
Chapter:
Types of Electromyographic Abnormalities
Author(s):

Jun Kimura

DOI:
10.1093/med/9780199738687.003.0014
Page of

PRINTED FROM OXFORD MEDICINE ONLINE (www.oxfordmedicine.com). © Oxford University Press, 2021. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a title in Oxford Medicine Online for personal use (for details see Privacy Policy and Legal Notice).

date: 28 November 2021

This chapter describes types of electromyographic abnormalities, which include decreased and prolonged insertional activities, insertional positive waves, myotonic discharges, and spontaneous activities such as fibrillation potentials, positive sharp waves, complex repetitive discharges, fasciculation potentials, and myokymic and neuromyotonic discharges. The four steps of electromyography help categorize motor dysfunction into upper and lower motoneuron disorders and myogenic lesions. Isolated discharges of single motor axons induced by voluntary effort give rise to motor unit potentials. Diseases of the nerve or muscle cause structural or functional disturbances of the motor unit, which in turn lead to alterations in the waveform and discharge patterns of their electrical signals. Certain characteristics of such abnormalities suggest a particular pathologic process, providing information useful in elucidating the nature of the disease.

Access to the complete content on Oxford Medicine Online requires a subscription or purchase. Public users are able to search the site and view the abstracts for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.