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Combined effects of APOE genotype, blood pressure, and antihypertensive drug use on incident AD.
OBJECTIVETo study the hypotheses that APOE-epsilon4 allele may interact with blood pressure to affect Alzheimer's disease (AD) occurrence and that antihypertensive therapy could modify such an effect.
METHODSA dementia-free cohort of 966 community-dwelling persons aged 75 years and older in Stockholm, Sweden was followed to detect patients with AD using the Diagnostic and Statistical Manual of Mental Disorders, Revised Third Edition (DSM-III-R) diagnostic criteria. Data were analyzed using Cox proportional hazards models with adjustment for several potential confounders.
RESULTSDuring a 6-year follow-up period, AD was diagnosed in 204 persons. APOE-epsilon4 allele, high systolic pressure (> or = 140 mm Hg), and low diastolic pressure (<70 mm Hg) were associated with an increased risk of AD. APOE-epsilon4 allele combined with low diastolic pressure greatly increased the risk of AD independent of antihypertensive drug use. Antihypertensive therapy significantly reduced the risk of AD regardless of APOE-epsilon4 status and counteracted the combined risk effect of the epsilon4 allele with high systolic pressure on the disease.
CONCLUSIONSElderly people with genetic susceptibility for Alzheimer's disease may experience a further increased disease risk if they have either high systolic pressure or low diastolic pressure. Antihypertensive therapy decreases the risk of Alzheimer's disease exerted by the APOE-epsilon4 allele.
Aging Research Center, Division of Geriatric Epidemiology and Medicine, Department of Neurotec, Karolinska Institutet and the Stockholm Gerontology Research Center, Stockholm, Sweden. firstname.lastname@example.org, ,
Pub Type(s)Journal Article
Research Support, Non-U.S. Gov't