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[Triphasic waves in dementia syndromes].

A Primavera1, F Traverso, P Perfumo

  • 1Istituto di Clinica Neurologica, Università, Genova.

Rivista Di Neurologia
|July 1, 1989
PubMed
Summary
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Triphasic waves on electroencephalograms (EEGs) are rare, appearing in less than 1% of recordings. They are most commonly associated with metabolic encephalopathies and dementia, including Alzheimer's disease.

Area of Science:

  • Neurology
  • Neurophysiology

Context:

  • Triphasic waves are distinctive EEG patterns.
  • Their occurrence is infrequent, noted in 0.49% of 14,458 recordings.
  • The study analyzed 71 EEGs with triphasic waves from 53 patients.

Purpose:

  • To investigate the prevalence and clinical associations of triphasic waves in EEG recordings.
  • To characterize the EEG findings of triphasic waves in patients with metabolic encephalopathies and dementia, including Alzheimer's disease.

Summary:

  • Triphasic waves were identified in 0.49% of EEGs (71 out of 14,458).
  • The majority of these cases involved patients with metabolic encephalopathies (29) or dementia (24).
  • In Alzheimer's disease patients, triphasic waves were atypical, presenting as single/short bursts, occipital predominance, or asymmetrical bilateral patterns.

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Impact:

  • This research refines the understanding of triphasic wave significance in neurological conditions.
  • It highlights the atypical presentation of triphasic waves in Alzheimer's disease.
  • Distinguishing triphasic wave patterns aids in differential diagnosis, particularly from Creutzfeldt-Jakob disease.