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Related Experiment Videos

A-waves and electrophysiologically established diagnoses.

E Gozke1, D Celebi, N Dortcan

  • 1PTT Teaching Hospital. erengozke@superonline.com

Electromyography and Clinical Neurophysiology
|March 5, 2003
PubMed
Summary

A-waves, abnormal nerve signals, were found in 2.36% of electromyography (EMG) studies, primarily in patients with radiculopathy, often involving the tibial nerve. These findings suggest A-waves warrant remarking during routine EMG examinations.

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Area of Science:

  • Neurology
  • Clinical Neurophysiology

Background:

  • A-waves are electrophysiologic potentials that can be observed during nerve conduction studies.
  • Their exact mechanism and clinical significance are not fully understood.
  • Their presence may indicate underlying neurological conditions.

Purpose of the Study:

  • To investigate the occurrence and characteristics of A-waves in patients undergoing electromyography (EMG).
  • To identify the diagnoses and nerves most commonly associated with A-waves.
  • To determine the prevalence of A-waves in a clinical EMG laboratory setting.

Main Methods:

  • Analysis of F-response studies in 1604 patients referred to an EMG laboratory.
  • Evaluation of A-waves with stable latencies and amplitudes across varying stimulation intensities.

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  • Recording of electrophysiologic diagnoses and affected nerves in cases with A-waves.

    • Main Results:

    • A-waves were detected in 38 out of 1604 cases (2.36%).
    • Radiculopathy was the most common diagnosis (57.8%) in patients with A-waves.
    • The tibial nerve was most frequently implicated in A-wave detection.
    • Electrophysiologic analysis yielded normal results in 5 cases with A-waves.

    Conclusions:

    • A-waves are an uncommon finding in routine EMG examinations.
    • Their presence is often associated with radiculopathies, particularly affecting the tibial nerve.
    • It is recommended to note A-waves during routine electrophysiologic assessments, despite incomplete understanding of their mechanism.