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Quantitative analyses of EEG with special electrodes in TGA patients

 Dept. of Neurology (신경과학교실) 
Issue Date
Dept. of Medicine/석사
Transient global amnesia (TGA) is a clinical diagnosis of sudden onset amnesia resolving within 24 hours with no neurological deficits. Known routine EEG findings are mostly normal or temporal spike and slow waves. We compared EEG differences between TGA and normal patients through quantitative EEG (qEEG) and low-resolution brain electromagnetic tomography (LORETA). We retrospectively selected 37 TGA patients and 9 normal controls and analyzed the EEG with nasopharyngeal (PG1 and PG2) and anterior temporal (T1 and T2) electrodes. Spectral powers and current densities were computed in 6 different frequency bands by fast Fourier transform and by LORETA. Means were compared in 23 channels and 8 scalp regions. In TGA patients, mean delta and theta relative spectral power were significantly lower in bilateral temporal, central and parieto-occipital regions, respectively (p<0.05). Mean beta relative spectral power was significantly higher in right parieto-occipital (p<0.05) and insignificantly higher in left parieto-occipital region (p=0.067). In LORETA, beta2 and gamma frequency densities were significantly increased in both parieto-temporo-occipital and limbic regions (p<0.01). Statistical comparison of qEEG and LORETA showed significant differences in several frequencies, suggestive of bilateral parieto-occipital involvement. However, in qEEG relative power analysis, the significance was greater in right side. This is inconsistent to previous studies reporting bilateral or left dominance of qEEG in TGA patients. Also, beta power was significantly increased in TGA patients in our study, opposite to previous study.
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1. College of Medicine (의과대학) > Dept. of Neurology (신경과학교실) > 2. Thesis
Yonsei Authors
Kim, Hye Ihn(김혜인)
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