The climbers state that because one of Renan's vertebral arteries is occluded, he has lost half his brains blood supply. The brain is supplied by two vertebral arteries as well as two carotid arteries. The carotid arteries provide the majority of blood flow, though even if they were equal to the vertebral arteries he would have lost only 25% of flow initially. Additionally, over time the body compensates and so his net blood supply would not be diminished.
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