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From the Department of Neurology (Drs. Reed, Jagust, and Seab), School of Medicine, University of California, Davis, and Veterans Administration Medical Center, Martinez, CA; Donner Laboratory (Drs. Jagust and Seab), Lawrence Berkeley Laboratory, University of California, Berkeley, CA; and Veterans Administration Medical Center (Dr. Ober), Livermore, CA.
We performed SPECT perfusion imaging and memory testing with mildly and moderately demented Alzheimer's disease (AD) patients and with healthy controls. All patients had memory abnormalities, but 5 of the 21 patients had neither temporal nor parietal perfusion abnormalities, indicating that temporoparietal blood flow may be normal at a point when memory is pathologic and the clinical diagnosis of AD is possible.
Address correspondence and reprint requests to Dr. Reed, University of California, Davis, Northern California Alzheimer's Disease Center, Herrick Hospital and Health Center, 2001 Dwight Way, Berkeley, CA 94704.
Supported by NIH grants AG05890 and AG07793 from the National Institute on Aging.
Received December 30, 1988. Accepted for publication in final form May 23, 1989.
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