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Cerebral blood flow and brain function in hypertension
M Fujishima1, S Ibayashi, K Fujii
1Second Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Summary
Hypertension reduces brain blood flow and cognitive function in humans and rats. Long-term blood pressure control may improve these deficits, suggesting a link between hypertension and brain health.
Area of Science:
- Neurology
- Cardiovascular Science
- Gerontology
Background:
- Hypertension is a prevalent condition associated with various health complications.
- Cerebrovascular changes and cognitive decline are potential consequences of sustained high blood pressure.
- Animal models offer insights into the mechanisms linking hypertension and brain dysfunction.
Purpose of the Study:
- To investigate the effects of hypertension on cerebral blood flow and metabolism in humans and spontaneously hypertensive rats.
- To assess the impact of hypertension on cognitive function in elderly hypertensive individuals and aged spontaneously hypertensive rats.
- To evaluate the potential benefits of antihypertensive treatment on cerebrovascular and cognitive impairments.
Main Methods:
- Positron emission tomography (PET) was used to measure regional cerebral blood flow and oxygen metabolism in human patients.
- Brain imaging techniques were employed to identify white matter vascular lesions in elderly hypertensives.
- Behavioral tests (maze tests) were conducted to assess spatial memory and learning in rats.
- Cerebral glucose utilization was measured in specific brain regions of rats.
Main Results:
- Mild hypertensive patients showed reduced cerebral blood flow in the frontal cortex and basal ganglia.
- Moderate to severe hypertensive patients exhibited diminished cerebral oxygen metabolism.
- Elderly hypertensives had more white matter lesions and impaired cognitive function compared to normotensives.
- Spontaneously hypertensive rats displayed decreased cerebral blood flow and impaired spatial memory and learning.
- Antihypertensive treatment in rats improved cerebral blood flow, reduced arterial wall thickness, and enhanced cognitive function.
Conclusions:
- Long-standing hypertension, independent of other factors, can lead to reduced cerebral blood flow, metabolism, and cognitive function.
- These hypertension-induced deficits in brain function appear to be reversible or improvable with sustained antihypertensive therapy.
- The findings highlight the critical importance of managing hypertension for preserving brain health and cognitive function across the lifespan.