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Incompetent circle of Willis and vertebrobasilar insufficiency
The Annals of Otology, Rhinology, and Laryngology
|August 28, 2003
Summary
Vertebrobasilar insufficiency is linked to structural vascular defects, affecting brain blood flow. Incomplete Circle of Willis and blocked arteries significantly increase hindbrain perfusion deficits, causing dysfunction.
Area of Science:
- Neurology
- Vascular Imaging
- Neuroanatomy
Background:
- Vertebrobasilar insufficiency (VBI) presents with diverse neurological symptoms.
- Understanding the vascular underpinnings of VBI is crucial for diagnosis and treatment.
Purpose of the Study:
- To analyze the vascular basis of VBI.
- To compare vascular findings in symptomatic VBI patients with asymptomatic individuals.
Main Methods:
- Magnetic resonance imaging (MRI) and angiography were used.
- 135 subjects with VBI were examined and compared to a control group.
Main Results:
- Symptomatic VBI patients showed significant differences in intracerebral collateralization and regional perfusion.
- Structural defects like stenosis or absence of posterior communicating arteries were noted.
- Occlusion of internal carotid or vertebral arteries combined with an incomplete Circle of Willis heightened hindbrain perfusion deficits.
Conclusions:
- Structural vascular abnormalities are key factors in VBI.
- Impaired collateral circulation and perfusion deficits contribute to hindbrain dysfunction symptoms.