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Blood Pressure Variability and Cognitive Function in the Elderly
1Department of Internal Medicine, Seoul National University College of Medicine, Seoul, and Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
Insights
High blood pressure variability is linked to cognitive decline in older adults. Understanding these connections is crucial for managing dementia risk in the aging population.
Area of Science:
- Gerontology
- Neurology
- Cardiovascular Medicine
Background:
- Hypertension is a prevalent condition in the elderly, significantly increasing risks for cardiovascular and cerebrovascular diseases.
- Growing evidence links hypertension to the development and progression of cognitive impairment and dementia in older adults.
- Cerebral hypoperfusion and increased blood pressure variability are implicated pathways, associated with conditions like white matter hyperintensities and brain atrophy.
Purpose of the Study:
- To review existing evidence on the association between blood pressure variability and cognitive impairment in the elderly.
- To explore the biological mechanisms underlying the relationship between blood pressure fluctuations and cognitive decline.
- To highlight the implications for understanding dementia risk in an aging population.
Main Methods:
- Literature review of existing studies and clinical trials.
- Analysis of evidence linking blood pressure variability to cognitive function.
- Examination of proposed biological pathways, including cerebral blood flow, neurohumoral activation, and inflammation.
Main Results:
- Increased blood pressure variability is significantly associated with cognitive impairment and dementia in the elderly.
- Mechanisms include cerebral hypoperfusion, endothelial dysfunction, inflammation, and oxidative stress.
- Clinical trials offer limited evidence for the protective effects of antihypertensive therapy against cognitive decline.
Conclusions:
- Blood pressure variability is a critical factor in cognitive impairment among the elderly.
- Further research is needed to clarify the role of antihypertensive therapies in preventing dementia.
- Understanding BP variability is essential for geriatric health and dementia prevention strategies.
Abstract:
With the increase in the aging population, it is important to understand the individual diseases and their interactions which are prevalent and have a great impact on the health status of the elderly. Hypertension is one of the most common diseases in older age and may impact the health status because it is the main risk factor for cardiovascular and cerebrovascular diseases such as heart failure and stroke. Recently, much evidence has been accumulated showing that hypertension plays an important role in the development and progression of cognitive impairment and dementia. Cerebral hypoperfusion secondary to severe atherosclerosis resulting from long-standing hypertension may be a major biological pathway linking high blood pressure (BP) to cognitive decline and dementia. Furthermore, increased BP variability has also been reported to be significantly associated with white matter hyperintensities and brain atrophy, which are predisposing conditions of dementia, depression, and falls in the elderly even after adjusting for BP levels and other confounding variables. Several mechanisms have been shown to be involved in the association between BP variability and cognitive impairment in elderly individuals. In addition to an increased cerebral blood flow fluctuation, neurohumoral activation, endothelial dysfunction, inflammation, and oxidative stress have been suggested to be the underlying mechanisms. However, clinical trials provide limited evidence for a protective effect of antihypertensive therapy against dementia and stroke-related cognitive decline. In this article, we aimed to review the existing evidence of the connection between BP variability and cognitive impairment in elderly people.
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Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.