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Verbal memory test best indicator of who will have Alzheimer's disease, new study says

CHICAGO -- Incidence of Alzheimer's Disease is expected to increase as the population of elderly grows. Early diagnosis and treatment will be the key to lessening the disease's worst effects, but, how to spot the disease before its symptoms become serious (and harm is already done) is a challenge for health professionals. A new study by psychologists Konstantine K. Zakzanis, Ph.D., and Mark Boulos, B.Sc., of the University of Toronto has determined that the best predictor of future Alzheimer's type dementia is a verbal memory test. Their study will be presented in Chicago at the 110th Annual Convention of the American Psychological Association (APA).

In a meta-analysis of 31 studies amounting to 1,144 Alzheimer's patients and 6,046 healthy controls, Zakzanis and Boulos looked at both neuropsychological and neuroimaging tests to determine their ability to detect preclinical dementia and/or Alzheimer's disease. They also paired a genetic susceptibility (presence of the ApoE gene) to dementia/Alzheimer's with results on both neuropsychological and neuroanatomic tests again attempting to identify which types of tests would prove most accurate in identifying preclinical disease in patients with the ApoE gene.

Specifically, their findings support the use of the California Verbal Learning Test (long delay recall and percent recall) as the best predictor of Alzheimer's type dementia, with executive function type measures also being predictive but less so than both the long and short delay memory tests.

Changes in the hippocampus were the best volumetric or neuroimaging measure but in general volumetric measures were less sensitive to preclinical stages of the dementia than were the neuropsychological tests.

Ironically, while memory assessments were also more predictive of preclinical Alzheimer's than neuroimaging tests for people with the ApoE gene, the most predictive test for such persons still appears to be an odor identification test.
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Contact: APA Public Affairs Office
public.affairs@apa.org
202-336-5700
American Psychological Association
25-Aug-2002


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