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Cerebral hemodynamics in relation to patterns of collateral flow
M Kluytmans1, J van der Grond, K J van Everdingen
1Department of Radiology, Image Sciences Institute, Department of Neurology, University Hospital Utrecht, Utrecht, Netherlands.
Stroke
|July 2, 1999
Summary
In severe carotid artery disease, collateral flow patterns significantly impact brain perfusion. Anterior communicating artery flow indicates better hemodynamic status, while its absence or posterior-only flow suggests worsened cerebral perfusion.
Area of Science:
- Neurology
- Radiology
- Vascular Medicine
Background:
- Severe carotid artery disease compromises cerebral blood flow.
- Collateral pathways are crucial for maintaining brain perfusion.
- Understanding collateral flow is vital for managing stroke risk.
Purpose of the Study:
- To investigate the relationship between collateral flow pathways and hemodynamic parameters.
- To assess these parameters using dynamic susceptibility contrast-enhanced MRI.
- To analyze findings in patients with severe internal carotid artery disease.
Main Methods:
- Dynamic susceptibility contrast-enhanced MRI in 66 patients and 33 controls.
- Categorization of patients by internal carotid artery (ICA) stenosis or occlusion.
- Assessment of collateral flow via the circle of Willis (MR angiography) and ophthalmic artery (transcranial Doppler).
Main Results:
- Patients with ICA stenosis showed preserved perfusion, independent of collaterals.
- Unilateral ICA occlusion led to impaired perfusion, but circle of Willis flow improved hemodynamic parameters.
- Anterior and posterior communicating artery collateralization was linked to better cerebral blood volume than posterior-only flow.
Conclusions:
- Collateral supply patterns significantly influence hemodynamic status in unilateral ICA occlusion.
- Anterior communicating artery collateral flow signifies preserved hemodynamics.
- Absence or posterior-only circle of Willis flow indicates deteriorated cerebral perfusion.