Abstract
The aim of this review is to determine the influence of coincidental cerebrovascular pathology on the symptomatology and course of Alzheimer's disease (AD). The link between stroke and AD is probably higher than expected by chance for the following reasons: (i) both pathologies share genetic risk factors such as the epsilon 4 allele of the apolipoprotein E gene; (ii) AD patients have changes in the brain vessels that may lead to either ischemic or hemorrhagic stroke or white matter changes or both; (iii) there is evidence of an increased risk of stroke in AD patients; (iv) there is evidence of a frequent association of AD and stroke at autopsy. Because of the summation of the various types of lesions, stroke lesions may lead to an increase progression of cognitive decline in AD patients. Recognition of a vascular component in a dementia syndrome is therefore useful for the management of AD patients. Whether an optimal management of risk factors for stroke may delay the clinical expression of dementia in patients with preclinical Alzheimer pathology should be evaluated.
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