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Related Experiment Videos

Periodic EEG patterns observed in two cases with partial seizures.

A Terao, S Tawara, Y Takemoto

    Folia Psychiatrica Et Neurologica Japonica
    |January 1, 1977
    PubMed
    Summary

    This study reports two cases of partial seizures with periodic electroencephalogram (EEG) patterns. Findings suggest these patterns can arise from brain metastases or subclinical seizure activity in idiopathic hypoparathyroidism.

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    Area of Science:

    • Neurology
    • Epileptology
    • Neurophysiology

    Background:

    • Partial seizures can present with diverse electroencephalogram (EEG) findings.
    • Periodic EEG patterns, such as periodic lateralized epileptiform discharges (PLEDs), are often associated with focal brain lesions.

    Observation:

    • Case 1: A 74-year-old woman with metastatic pancreatic cancer exhibited PLEDs, epilepsia partialis continua, and postmortem evidence of right parietooccipital metastasis with white matter demyelination.
    • Case 2: A 61-year-old woman with idiopathic hypoparathyroidism experienced partial complex seizures with an anterior temporal spike focus and a periodic EEG pattern in the right temporal region, without detectable structural brain abnormalities.

    Findings:

    • Periodic EEG patterns can be associated with both structural brain lesions (e.g., metastasis) and functional abnormalities (e.g., subclinical seizure discharges in metabolic disorders).

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  • PLEDs in Case 1 were hypothesized to result from disrupted cortical connections due to the metastatic lesion and associated white matter changes.
  • The periodic pattern in Case 2 was presumed to represent subclinical focal seizure discharges originating from deep right anterior temporal structures.

    • Implications:

    • Understanding the diverse origins of periodic EEG patterns is crucial for accurate diagnosis and management of partial seizures.
    • This study highlights the importance of considering both structural and metabolic etiologies when interpreting periodic EEG patterns in patients with epilepsy.
    • Further research may elucidate the precise mechanisms underlying periodic EEG generation in various neurological conditions.