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Stroke risk factors and development of collateral flow in carotid occlusive disease
P Hedera1, J Bujdáková, P Traubner
1First Neurological Clinic, University Hospital, Department of Neurology, Medical School of Comenius University, Bratislava, Slovakia.
Insights
Hypertension hinders the development of intracranial collateral vessels in patients with carotid occlusive disease. This impacts stroke risk and outcome by limiting compensatory blood flow.
Area of Science:
- Cerebrovascular disease research
- Neurology and neurosurgery
- Medical imaging and diagnostics
Background:
- Collateral blood flow is crucial for compensating reduced flow in stenotic or occluded extracranial carotid arteries.
- The extent of collateral circulation significantly influences stroke likelihood and patient outcomes.
- Understanding the interplay between stroke risk factors and collateral vessel development is vital for risk stratification.
Purpose of the Study:
- To investigate the relationship between common stroke risk factors and the number of patent intracranial collateral vessels.
- To assess how hypertension, coronary artery disease, diabetes mellitus, tobacco smoking, and hypercholesterolemia affect collateral circulation.
- To determine the impact of carotid artery stenosis or occlusion on collateral vessel patency.
Main Methods:
- Studied 182 patients with varying degrees of internal carotid artery stenosis confirmed by angiography.
- Evaluated collateral contribution from anterior and posterior communicating arteries using compression tests and transcranial Doppler ultrasonography.
- Correlated the number of detected collateral vessels with patient-reported stroke risk factors.
Main Results:
- Patients with >75% stenosis or occlusion of the internal carotid artery showed a higher frequency of two major intracranial collateral vessels.
- Hypertensive patients with severe stenosis or occlusion were more likely to have only a single collateral vessel compared to non-hypertensives.
- Other analyzed stroke risk factors (diabetes, hypercholesterolemia, smoking, CAD) did not significantly affect collateral vessel patency.
Conclusions:
- Hypertension was identified as a significant factor that hinders the development of preformed intracranial collateral vessels in patients with carotid occlusive disease.
- The findings suggest that hypertension may compromise the brain's ability to develop compensatory blood flow pathways, potentially increasing stroke risk.
Background And Purpose:
Blood flow through collateral vessels compensates for reduced blood flow through stenotic or occluded extracranial carotid arteries. Previous studies have shown that extent of collateral flow influences likelihood of stroke and its outcome. Here we analyzed the relationship between stroke risk factors (hypertension, coronary artery disease, diabetes mellitus, tobacco smoking and hypercholesterolemia) and number of patent intracranial collaterals detected by transcranial Doppler ultrasonography.
Subjects And Methods:
We studied 182 patients with various degrees of angiography proven unilateral stenosis of the internal carotid artery. Contribution of the anterior and posterior communicating arteries to the perfusion of the cerebral hemisphere on the side of the stenosis or occlusion was evaluated by a series of compression tests performed during continuous insonation of the middle cerebral artery. The number of detected collateral vessels was correlated with analyzed stroke risk factors.
Results:
Subjects with stenosis more than 75% or occlusion of the internal carotid artery had a higher frequency of two major intracranial collateral vessels (P< or =0.01 and P< or =0.001, respectively). Hypertensive patients with stenosis more than 75% or total carotid occlusion were more likely to have only a single collateral vessel than patients without hypertension (P< or =0.01 and P< or =0.05, respectively). Other risk factors did not influence the patency of preformed collateral vessels.
Conclusions:
Hypertension hindered the development of preformed intracranial collateral vessels in our patients with carotid occlusive disease.