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Propagated insertional activity: a model of positive sharp wave generation.

Daniel Dumitru1, Carlos T J Martinez

  • 1Department of Rehabilitation Medicine, University of Texas Health Science Center, San Antonio, Texas 78229-3900, USA. dumitru@uthscsa.edu

Muscle & Nerve
|August 1, 2006
PubMed
Summary

This study reveals two main electromyographic insertional activity types: biphasic initially-negative and monophasic positive. Monophasic positive activity models positive sharp waves, likely from needle-induced muscle membrane crush.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering

Background:

  • Electromyography (EMG) insertional activity characterization is crucial for diagnosing neuromuscular disorders.
  • Previous understanding of positive sharp waves (PSWs) suggested they are blocked fibrillation potentials.

Purpose of the Study:

  • To characterize different categories of electromyographic insertional activity using a dual monopolar needle technique.
  • To investigate the generation mechanisms of single muscle fiber insertional discharges and propagated waveforms.
  • To propose a new model for positive sharp wave generation.

Main Methods:

  • Utilized a dual monopolar needle recording technique to assess insertional activity from single muscle fibers.
  • Analyzed six combinations of insertional activity and identified fundamental discharge configurations.

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Main Results:

  • Identified two fundamental single muscle-fiber insertional discharge configurations: biphasic initially-negative and monophasic positive.
  • Propagated waveforms were primarily triphasic initially-positive, rarely monophasic positive.
  • Monophasic positive insertional activity is postulated to originate from needle-induced peri-electrode membrane crush.

Conclusions:

  • The study proposes that monophasic positive insertional activity serves as a model for positive sharp wave generation.
  • It is postulated that most positive sharp waves originate from needle-induced muscle membrane crush at the insertion site, challenging prior theories.