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Relation of EEG alpha background to parietal lobe function in Alzheimer's disease as measured by positron emission tomography and psychometry

From the Epilepsy Branch (Dr. Sheridan), the Medical Neurology Branch (Dr. Sato, Ms. Cox, and Dr. Fedio), and the Experimental Therapeutics Branch (Drs. Foster, Bruno, and Chase), National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, MD.

Fourteen patients with Alzheimer's disease were evaluated by psychometric testing, fluorodeoxyglucose positron emission tomography (PET), and EEG. They were divided into two groups according to the EEG findings. Group A (seven patients) had normal alpha backgrounds and group B (seven patients) had decreased alpha backgrounds. Group A had significantly higher WAIS Performance IQ scores (p = 0.005) than group B. Group A also had higher Weschler Memory Scale scores (p = 0.047) and parietal glucose metabolic rates (p = 0.038) than group B, but these differences are not statistically significant given the multiple comparisons made between the two groups. Relative intactness of parietal lobe function, as measured by psychometric testing and PET, appears to correlate with preservation of EEG alpha background. The EEG may be useful in assessing regional cortical involvement or the clinical stage in Alzheimer's disease.

Address correspondence and reprint requests to Dr. Sheridan, Epilepsy Branch, NINCDS, Federal Building, Room 114, Bethesda, MD 20892.

Presented in part at the annual meeting of the American Electroencepnalographic Society, Salt Lake City, UT, September 1984.

Received September 11, 1986. Accepted for publication in final form August 31, 1987.

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