Topographic EEG analysis in two patients with basilar thrombosis

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The EEG activity of two patients with occlusion of the vertebral and basilar arteries was analyzed. Power maps, peak power frequency, and field power differences during both photic drive and verbal command were evaluated. Clinical findings of one patient fit the criteria of locked-in syndrome. Photic stimulation and event related desynchronization paradigm was used for testing the reactivity of EEG. Averaged EEG epochs during intended movement after verbal command showed significant alpha and subalpha power reduction. Regional differences of EEG reactivity were assumed secondary to the underlying hemispheric infarcts. Awareness of the patient in a locked-in state was documented by EEG analysis. In the second case permanent vegetative state was associated with a nonreactive rhythmic alpha pattern. Time sequence analysis of power ratios showed spontaneous alternating activity of alpha and subalpha generators. The authors conclude that pseudo-periodic fluctuation of alpha activity reflects partial preservation of thalamo-cortical connections.

Original languageEnglish
Pages (from-to)138-145
Number of pages8
JournalClinical EEG Electroencephalography
Volume24
Issue number3
Publication statusPublished - 1993

Fingerprint

Electroencephalography
Thrombosis
Persistent Vegetative State
Photic Stimulation
Basilar Artery
Quadriplegia
Vertebral Artery
Sequence Analysis

Keywords

  • Locked-In Syndrome
  • Sensory Stimulation
  • Topographic EEG

ASJC Scopus subject areas

  • Clinical Neurology

Cite this

Topographic EEG analysis in two patients with basilar thrombosis. / Kamondi, A.; Szirmai, I.

In: Clinical EEG Electroencephalography, Vol. 24, No. 3, 1993, p. 138-145.

Research output: Contribution to journalArticle

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