6 doctors weighed in:

Why compressing both left and right common carotid arteries leads to brain death when vertebral arteries(and also circle of willis) still supply .

6 doctors weighed in
Dr. William Gaya
Neurology
4 doctors agree

In brief: Carotid occlusion

The vertebral arteries are not enough to sustain the entire blood brain perfusion.
They contribute to the anterior circulation by means of the posterior communicating arteries. There are common anatomical variants and in some cases these arteries are not patent or existent. The situation you describe may and most likely cause a massive brain infarction with subsequent brain herniation/death.

In brief: Carotid occlusion

The vertebral arteries are not enough to sustain the entire blood brain perfusion.
They contribute to the anterior circulation by means of the posterior communicating arteries. There are common anatomical variants and in some cases these arteries are not patent or existent. The situation you describe may and most likely cause a massive brain infarction with subsequent brain herniation/death.
Dr. William Gaya
Dr. William Gaya
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Dr. Thomas Dowling
Orthopedic Surgery - Spine

In brief: Because carotids are

The main supply vessels & an acute obstruction of these does not lead to any time for possible but unlikely adaptations to flow through the vertebral vessels & the circle of willis that may occur over time if there was a slow process of occlusion involved but in general, even that is unlikely to occur.When this collateral development of circulation can occur in other areas of the body but not all.

In brief: Because carotids are

The main supply vessels & an acute obstruction of these does not lead to any time for possible but unlikely adaptations to flow through the vertebral vessels & the circle of willis that may occur over time if there was a slow process of occlusion involved but in general, even that is unlikely to occur.When this collateral development of circulation can occur in other areas of the body but not all.
Dr. Thomas Dowling
Dr. Thomas Dowling
Thank
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