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Review
. 2008 May 6;585(1):97-108.
doi: 10.1016/j.ejphar.2008.02.049. Epub 2008 Mar 4.

Diabetes and other vascular risk factors for dementia: which factor matters most? A systematic review

Raoul P Kloppenborg  1 , Esther van den Berg, L Jaap Kappelle, Geert Jan Biessels
Affiliations
Review

Diabetes and other vascular risk factors for dementia: which factor matters most? A systematic review

Raoul P Kloppenborg et al. Eur J Pharmacol. .

Abstract

Vascular risk factors, such as type 2 diabetes, hypertension, obesity and dyslipidaemia often co-occur. Each of these factors has been associated with an increased risk of dementia, but it is uncertain which factor imposes the greatest risk. Moreover, the effect of age at time of exposure may differ across factors. This paper systematically reviews the evidence for the association of each of these risk factors with dementia. Longitudinal population-based studies that assessed the incidence of dementia in relation to diabetes (n=14), hypertension (n=13), dyslipidaemia (n=8) or obesity (n=9) were included. All four risk factors were indeed associated with an increased risk of dementia, but the results of studies on diabetes and obesity were most consistent. The magnitude of the effects was comparable across the risk factors, with odds ratios for 'any dementia' around 1.5. For hypertension, obesity and dyslipidaemia age appeared to modulate the association: the risk of dementia was generally largest in studies that measured the risk factor in midlife (compared to late life) and had a long follow-up time. At midlife, the population attributable risk of dementia was highest for hypertension, up to 30% of cases of late life dementia. Later in life diabetes appears to convey the highest risk of dementia. This review shows that vascular risk factors should be regarded as a major target for preventive measures, but that timing of such measures appears to be critical.

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