title: Prognostic relevance of quantitative topographical EEG in patients with poststroke aphasia.
abstract: In this prospective study we analyzed the prognostic value of topographical quantitative EEG (qEEG) in poststroke aphasia. Twenty-three right-handed patients (ages 56 +/- 12 years) with different types of aphasia were studied. Quantitative EEG under resting conditions and an aphasia test battery were applied twice, 2 and 8 weeks after a stroke. EEG power fast Fourier transform was performed for delta (2-3.5 Hz), theta (4-7.5 Hz), alpha (8-13 Hz), and beta (13.5-20 Hz) frequency bands. EEG abnormalities within and outside speech relevant areas are related to restitution of poststroke aphasia. In the ischemic regions they indicate local disturbances; outside they reflect failures in neuronal networks involved in the generation and propagation of the alpha rhythm.
authors.affiliation: Neurologische Universitätsklinik, Max-Planck-Institut für neurologische Forschung, Koln, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Szelies
authors.forename: R
authors.initials: R
authors.lastname: Mielke
authors.forename: J
authors.initials: J
authors.lastname: Kessler
authors.forename: W D
authors.initials: WD
authors.lastname: Heiss
mesh_terms: D000328:Adult; D000368:Aged; D000513:Alpha Rhythm; D001037:Aphasia / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D001921:Brain / Q000503:physiopathology; D001931:Brain Mapping; D004569:Electroencephalography; D005583:Fourier Analysis; D006801:Humans; D008875:Middle Aged; D009415:Nerve Net / Q000503:physiopathology; D011446:Prospective Studies; D020521:Stroke / Q000150:complications* / Q000503:physiopathology; D013826:Theta Rhythm