Lewy Body Dementia (DLB)and Alzheimer’s Disease (AD): severe slowing of thebackground rhythm with a peak frequency in the thetafrequency band (4 - 8 Hz) accompanied by frontal intermittentrhythmic delta activity (FIRDA) gives strongEEG support for DLB, whereas a diagnosis of AD is morelikely when the EEG is normal or when only mild diffuseslowing is found. The value of an EEG in the differentialdiagnosis between the most common causes ofdementia is dependent on the specific clinical problem.One of the clinical problems in which EEG has the highestyield is the distinction between the two most commondementia types, i.e. N2 - In this short clinically oriented review, the value ofelectroencephalography (EEG) in the diagnostic evaluationof cognitive decline is discussed, based on therecommendations of the European and Dutch guidelines.In general, an EEG with diffuse slowing with orwithout focal abnormalities argues for the presence ofan underlying neurodegenerative illness and againstsubjective memory complaints or a psychiatric illnesssuch as a depression. T1 - Electroencephalography in the differential diagnosis of dementia
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