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Morphologic changes during hypertension
1Department of Neuropathology, University of Glasgow, Scotland, United Kingdom.
Insights
Hypertension significantly impacts brain circulation and function, leading to various neurological complications. Intensive antihypertensive treatment can risk brain ischemia if blood pressure drops too rapidly.
Area of Science:
- Neurology
- Cardiovascular Science
- Cerebrovascular Medicine
Background:
- Hypertension profoundly affects cerebral circulation and neurological function.
- Neurologic dysfunction is a primary complication of elevated arterial pressure.
- Antihypertensive therapy is crucial for preventing these dysfunctions.
Purpose of the Study:
- To explore the intricate relationship between hypertension, its treatment, and brain circulation.
- To detail the cerebrovascular consequences of hypertensive disease.
- To understand the risks associated with antihypertensive interventions.
Main Methods:
- Review of existing literature on hypertension and cerebrovascular effects.
- Analysis of pathological changes in brain vasculature due to hypertension.
- Examination of clinical outcomes related to hypertensive brain injury and treatment.
Main Results:
- Hypertension alters cerebral blood flow autoregulation, often due to hyaline arteriosclerosis.
- Hypertensive vascular lesions contribute to atheroma, lacunar infarcts, cerebral infarction, multi-infarct dementia, and Binswanger's disease.
- Hypertension is linked to hemorrhagic strokes and severe brain lesions in malignant forms, with potential for ischemia during rapid blood pressure reduction.
Conclusions:
- Hypertension-induced vascular changes are a major cause of cerebrovascular disease.
- Antihypertensive treatment requires careful management to avoid iatrogenic ischemia.
- Understanding these mechanisms is vital for managing hypertensive patients and preventing neurological deficits.
Abstract:
Circulation to the brain is greatly affected by hypertension and by its treatment. Neurologic dysfunction is prominent among the complications of increased arterial pressure and is also most susceptible to preventive antihypertensive therapy. The upward resetting of the limits of autoregulation of cerebral blood flow in hypertension is probably due largely to structural thickening of the walls (hyaline arteriosclerosis) of the resistance vessels. Other consequences of hypertensive vascular lesions in the brain include increased formation of atheroma, lacunae and lacunar infarction, cerebral infarction, multi-infarct dementia and Binswanger's disease. There is also an association between hypertension and hemorrhagic strokes, namely, subarachnoid and intracerebral hemorrhage. Brain lesions are also prominent in malignant hypertension and hypertensive encephalopathy. Antihypertensive treatment, especially if intensive, can result in boundary zone ischemia in the brain if arterial pressure decreases steeply.