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Diffuse positive waves: case report.

P Nutter1, K Collins

  • 1Seattle Veterans Administration Medical Center, WA 98108.

Archives of Physical Medicine and Rehabilitation
|April 1, 1988
PubMed
Summary
This summary is machine-generated.

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Diffuse insertional positive waves, detected via needle EMG, can occur without apparent disease. This finding may indicate an intrinsic muscle membrane defect, but currently shows no associated neuromuscular deficit.

Area of Science:

  • Neurology
  • Electromyography (EMG)

Background:

  • Positive sharp waves on EMG typically indicate neurogenic, myogenic, or metabolic disorders.
  • Previous reports of diffuse insertional positive waves without underlying disease are limited.

Observation:

  • A patient presented with diffuse insertional positive waves on needle EMG.
  • The patient remained clinically normal over a three-year follow-up period.
  • No metabolic or electrolyte abnormalities were identified.

Findings:

  • The patient exhibited diffuse insertional positive waves on EMG.
  • No clinical neuromuscular deficit was observed.
  • Limited EMG screening in two children was normal.

Implications:

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  • This may represent a novel muscle fiber membrane instability or a form of myotonia.
  • The condition, detectable only by EMG, appears to have no current association with neuromuscular deficits.
  • Further research is needed to understand the underlying mechanism and long-term prognosis.