期刊
DEMENTIA AND GERIATRIC COGNITIVE DISORDERS
卷 28, 期 3, 页码 213-219出版社
KARGER
DOI: 10.1159/000236913
关键词
Blood pressure; Dementia; Alzheimer's disease; Longitudinal study
资金
- Loo and Hans Ostermans Foundation
- Swedish Research Council
- Swedish Council for Working Life and Social Research
- Gamla Tjanarinnor Foundation
- Alzheimer Foundation Sweden
Background/Aim: Midlife high blood pressure is linked to late-life dementia. We sought to investigate the temporal relation of blood pressure to the risk of dementia and Alzheimer's disease ( AD) among older adults. Methods: A dementia-free cohort (n = 422) aged >= 81 years was followed for 3 years to detect dementia and AD cases ( Diagnostic and Statistical Manual of Mental Disorders, Third Edition, Revised criteria). The blood pressure was measured 4 times over a 9-year period starting from >= 75 years of age. The data were analyzed with Cox models controlling for potential confounders. Results: During the 954 person-years of follow-up, 89 subjects developed dementia ( 72 AD cases). Low diastolic pressure (<70 vs. 70-89 mm Hg) was associated with a multiadjusted hazard ratio of 2.13 [95% confidence interval (CI) = 1.05-4.32] for dementia and 2.16 (95% CI = 0.98-4.73) for AD occurring over a 6- to 9-year period, whereas high diastolic pressure (>= 90 mm Hg) was marginally related to a decreased hazard ratio of 0.58 (95% CI = 0.33-1.02) for dementia and 0.57 (95% CI = 0.30-1.09) for AD. Systolic pressure was not significantly related to dementia risk. Subjects who developed dementia had a greater decline in blood pressure than persons who did not, mainly during the 3-year period before dementia diagnosis. Conclusion: Low diastolic pressure predicts the risk of dementia among very old people, and the blood pressure exhibits a substantial decline over around 3 years before the dementia syndrome becomes clinically evident. Copyright (C) 2009 S. Karger AG, Basel
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