| Annual variations of quantitative EEG in patients with chronic epilepsy. | |
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MedLine Citation:
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PMID: 19095583 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: Annual changes in powers of the close-eyed EEG were measured over 12 months in 12 patients with epilepsy. MATERIAL AND METHODS: The present study included 12 patients aged 14.6+/-2.7 years with chronic epilepsy, suffering for 6-14 years. EEGs were recorded every month between 9 and 11 a.m. Five patients had generalized seizures and 7 partial complex seizures secondarily generalized. Visual analysis of EEG was performed before the quantitative assessment. The signals were recorded using a set of 14 (F3, F4, F7, F8, C3, C4, P3, P4, 01, 02, T3, T4, T5, T6) scalp electrodes. For each patient, 20 artifact-free EEG epochs, each of 2 s. duration were selected for spectral analysis to calculate spectral power. The sampling frequency was 240 Hz. Frequencies below 1 Hz and above 70 Hz were eliminated by digital filtering. The channels were recorded relative to a vertex reference. A fast Fourier transformation algorithm of signal processing was used to obtain the power spectrum of each lead. Absolute power spectrum was calculated within 4 frequency bands: delta (1-3.99 Hz), theta (4-7.99 Hz), alpha (8-12.99 Hz), and beta (13-30.99 Hz). RESULTS: We found the abnormalities to be predominantly focal in EEG. None of the EEG recordings were normal, and the power spectra differed over the year. A statistically significant increase of delta and theta bands in May and a decrease of alpha bands in September was found. We did not find positive correlations between the changes in the quantitative EEG analysis and the number of seizures in patients. CONCLUSIONS: These findings suggest the annual variations of EEG in patients with chronic epilepsy. Furthermore studies are needed to clarify the annual variations of EEG among healthy volunteers. |
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Authors:
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W Sobaniec; W Kulak; B Bielewicz; P Sobaniec |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Advances in medical sciences Volume: 53 ISSN: 1896-1126 ISO Abbreviation: Adv Med Sci Publication Date: 2008 |
Date Detail:
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Created Date: 2008-12-19 Completed Date: 2009-03-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101276222 Medline TA: Adv Med Sci Country: Poland |
Other Details:
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Languages: eng Pagination: 321-5 Citation Subset: IM |
Affiliation:
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Department of Pediatric Neurology and Rehabilitation, Medical University of Bialystok, Poland. kneur2@wp.pl |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Child Chronic Disease Electroencephalography* Epilepsy / diagnosis*, physiopathology Fourier Analysis Humans Signal Processing, Computer-Assisted |
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