Parkinson ve Alzheimer hastalığında EEG arka plan aktivitesinin erken bilişsel işlev bozukluğu ile yavaşlaması.

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BackgroundSlowing of the electroencephalogram (EEG) is frequent in Parkinson's (PD) and Alzheimer's disease (AD) and correlates with cognitive decline. As overlap pathology plays a role in the pathogenesis of dementia, it is likely that demented patients in PD show similar physiological alterations as in AD.ObjectiveTo analyze distinctive quantitative EEG characteristics in early cognitive dysfunction in PD and AD.MethodsForty patients (20 PD- and 20 AD patients with early cognitive impairment) and 20 normal controls (NC) were matched for gender, age, and education. Resting state EEG was recorded from 256 electrodes. Relative power spectra, median frequency (4-14 Hz), and neuropsychological outcome were compared between groups.ResultsRelative theta power in left temporal region and median frequency separated the three groups significantly (p = 0.002 and p ConclusionIncrease of theta power in the left temporal region and a reduction of median frequency were associated with presence of AD or PD. PD patients are characterized by a pronounced slowing as compared to AD patients. Therefore, in both disorders EEG slowing might be a useful biomarker for beginning cognitive decline.

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