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Related Experiment Videos

Midline theta rhythm revisited

S Okada1, Y Urakami

  • 1Department of Psychiatry, Juntendo University School of Medicine, Tokyo, Japan.

Clinical EEG (Electroencephalography)
|January 1, 1993
PubMed
Summary
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Midline theta rhythm, an uncommon EEG finding, was identified in 0.83% of patients. This distinct brainwave pattern showed different characteristics and clinical associations in adults versus the elderly.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Midline theta rhythm is an infrequent electroencephalogram (EEG) finding.
  • It is characterized by runs of theta waves in midline central and parietal vertex regions.
  • Previous reports on this phenomenon are limited.

Purpose of the Study:

  • To investigate the clinical significance of midline theta rhythm.
  • To analyze the prevalence and characteristics of this EEG pattern.
  • To correlate findings with patient demographics and clinical diagnoses.

Main Methods:

  • Retrospective analysis of EEG examinations over a 9-month period.
  • Inclusion criteria: midline theta rhythm (4-7 Hz, >50 microV, >3 sec duration).
  • Analysis of patient age distribution, waveform morphology, and associated clinical disorders.

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Main Results:

  • Midline theta rhythm was detected in 35 (0.83%) of 4,236 patients.
  • Prevalence peaked in adults (21-40 years) and the elderly (61-77 years).
  • Adults exhibited sinusoidal waveforms linked to epilepsy; elderly patients showed irregular/triangular waveforms associated with cerebrovascular disorders, headaches, and dizziness.

Conclusions:

  • Midline theta rhythm has distinct clinical associations based on age.
  • In younger adults, it may indicate epilepsy.
  • In the elderly, it suggests organic brain diseases like cerebrovascular disorders.