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Treatment of cardiovascular risk factors to prevent cognitive decline and dementia: a systematic review

Authors Suzanne A Ligthart, Eric P Moll van Charante, Willem A Van Gool, et al

Published Date August 2010 Volume 2010:6 Pages 775—785

DOI http://dx.doi.org/10.2147/VHRM.S7343

Published 17 August 2010

Suzanne A Ligthart1, Eric P Moll van Charante1, Willem A Van Gool2, Edo Richard2
1Department of General Practice, 2Department of Neurology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
Background: Over the last decade, evidence has accumulated that vascular risk factors increase the risk of Alzheimer disease (AD). So far, few randomized controlled trials have focused on lowering the vascular risk profile to prevent or postpone cognitive decline or dementia.
Objective: To systematically perform a review of randomized controlled trials (RCTs) evaluating drug treatment effects for cardiovascular risk factors on the incidence of dementia or cognitive decline.
Selection criteria: RCTs studying the effect of treating hypertension, dyslipidemia, ­hyperhomocysteinemia, obesity, or diabetes mellitus (DM) on cognitive decline or dementia, with a minimum follow-up of 1 year in elderly populations.
Outcome measure: Cognitive decline or incident dementia.
Main results: In the identified studies, dementia was never the primary outcome. Statins (2 studies) and intensified control of type II DM (1 study) appear to have no effect on prevention of cognitive decline. Studies on treatment of obesity are lacking, and the results of lowering homocysteine (6 studies) are inconclusive. There is some evidence of a preventive effect of antihypertensive medication (6 studies), but results are inconsistent.
Conclusion: The evidence of a preventive treatment effect aimed at vascular risk factors on cognitive decline and dementia in later life is scarce and mostly based on secondary outcome parameters. Several important sources of bias such as differential dropout may importantly affect interpretation of trial results.
Keywords: cardiovascular risk factors, cognitive decline, dementia, prevention

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