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[Hypertensive vascular disease and cerebral microcirculation]
1Department of Neurology, Boston University Medical Center, Massachusetts 02118, USA.
Insights
Arterial hypertension impacts cerebral microcirculation differently based on duration. Chronic hypertension causes irreversible changes like white matter ischemia and lacunar infarcts, while acute hypertension leads to reversible blood-brain barrier changes and edema.
Area of Science:
- Neurology
- Vascular Biology
- Hypertension Research
Background:
- Cerebral microcirculation is intricately linked with arterial hypertension.
- Vessel size, location, and hypertension chronicity influence these interactions.
- Understanding these dynamics is crucial for neurological health.
Purpose of the Study:
- To elucidate the distinct effects of chronic and acute arterial hypertension on cerebral microcirculation.
- To correlate pathological and radiological findings with clinical manifestations.
Main Methods:
- Review of pathological and radiological findings in cerebral microcirculation.
- Analysis of clinical associations with hypertensive cerebrovascular changes.
Main Results:
- Chronic hypertension induces irreversible structural changes in small cerebral arteries, leading to white matter ischemia and lacunar infarcts.
- Acute hypertension causes reversible blood-brain barrier permeability increases, resulting in cerebral edema and focal neurological deficits.
- Clinical associations include dementia, motor disorders, pseudo-bulbar syndrome, and hypertensive encephalopathy.
Conclusions:
- Cerebral microvascular responses to hypertension are dichotomous: chronic leads to structural damage, acute to functional disruption.
- These distinct responses have significant clinical implications for neurological disorders.
- Further research into targeted interventions for hypertensive cerebrovascular disease is warranted.
Abstract:
Cerebral microcirculation has a series of complex relationships with arterial hypertension determined, on one hand, by the size and the location of the vessels involved, and on the other hand, by the chronic or acute nature of the hypertension. The small arterial vessels of the cerebral parenchyma react to the effects of chronic hypertension with irreversible structural changes, whose pathologic and radiological correlation is chronic ischemia of the white substance, shown by paleness of the white substance, together with small lacunar infarctions, with a clinical association of dementia, motor disorders and pseudo-bulbar syndrome. With the appearance of an acute rise in arterial pressure, these vessels react with generally reversible changes which lead to an increase in the permeability of the hematoencephalic barrier with formation of cerebral edema and a clinical association generally demonstrating the focal nature of the vascular abnormality (such as in hypertensive encephalopathy with changes in posterior hemispheric predominance) or its unilateral location in cases in which the process occurs in one of the carotid territories (post-endarterectomy).