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Triphasic waves in a psychiatric population: a retrospective study

I Blatt1, R P Brenner

  • 1Department of Neurology, Sheba Medical Center, Tel-Hashomer, Israel.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|July 1, 1996
PubMed
Summary
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Triphasic waves (TWs) are uncommon in psychiatric patients, primarily affecting elderly individuals with severe dementia. These EEG findings often correlate with background slowing and posterior abnormalities.

Area of Science:

  • Neurology
  • Psychiatry
  • Electroencephalography

Background:

  • Triphasic waves (TWs) are distinctive EEG patterns.
  • Their occurrence in psychiatric populations is infrequent.
  • Understanding TWs in this demographic is crucial for diagnosis.

Purpose of the Study:

  • To investigate the prevalence and characteristics of triphasic waves (TWs) in a psychiatric patient cohort.
  • To identify clinical and EEG features associated with TWs in this population.

Main Methods:

  • Retrospective analysis of 15,326 EEGs performed between 1983 and 1992.
  • Identification of 83 EEGs exhibiting TWs in 62 patients.
  • Analysis of EEG parameters including background rhythms, TWs distribution, periodicity, and epileptiform abnormalities.

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Main Results:

  • TWs were found in 83 EEGs (0.54%) from 62 patients (mean age 74 years).
  • Most patients (n=56) had severe dementia; 15 also had delirium.
  • Slow background rhythms (mean 6.2 Hz) were common; TWs were often posterior (n=47).

Conclusions:

  • Triphasic waves are uncommon in psychiatric patients, predominantly seen in the elderly with severe dementia.
  • TWs in this population are typically associated with background EEG slowing.
  • Posterior maximal distribution of TWs is frequent, with occasional periodicity observed.