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[Paramedian thalamo-mesencephalic infarct con triphasic waves]

J A Egido1, R Arroyo, C Soriano

  • 1Servicio de Neurología, Hospital Clínico San Carlos, Madrid.

Neurologia (Barcelona, Spain)
|March 1, 1996
PubMed
Summary

Triphasic waves on EEG, typically linked to metabolic issues, were observed in a rare case of top-of-the-basilar artery occlusion. This finding suggests triphasic waves may indicate broader diencephalic dysfunction.

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Area of Science:

  • Neurophysiology
  • Neurology
  • EEG Interpretation

Background:

  • Triphasic waves are an electroencephalogram (EEG) pattern often associated with metabolic encephalopathies.
  • Their precise pathophysiology and association with diverse etiologies remain incompletely understood.
  • Previous hypotheses suggest lesions affecting thalamocortical connections may underlie this EEG pattern.

Observation:

  • A unique case involving a patient with top-of-the-basilar artery occlusion is presented.
  • This occlusion resulted in a selective paramedian thalamic-mesencephalic infarct.
  • Triphasic waves were notably observed on the EEG during a period of clinical hypersomnia in this patient.

Findings:

  • This case represents the first documented instance of triphasic waves associated with a selective paramedian thalamomesencephalic infarct.

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  • The presence of triphasic waves in this context challenges their exclusive association with metabolic encephalopathies.
  • The findings suggest a potential link between specific diencephalic lesions and the generation of triphasic wave patterns.

    • Implications:

    • Triphasic waves may serve as a nonspecific indicator of diencephalic dysfunction.
    • The paramedian thalamomesencephalic reticular system is implicated as a potential generator of these EEG abnormalities.
    • This case broadens the understanding of EEG patterns in cerebrovascular events affecting deep brain structures.