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It is very important to remember that even though it is silent, that brain region is still alive — meaning that if the patient then rushes to the emergency room and gets treatment and the blood flow goes to 21 instead of 20, that part of the brain is going to go back to work. And so, at 20 there is silence, but life is still there in the cells. And then at around 12 or 13, there is not only silence but there is mayhem, there is destruction. The cells actually begin to die. Why? Because they have receptors that protect the inside of the cell and once the blood supply gets very low, those receptors open up, calcium comes rushing into the cell and begins to destroy it, and so cell death begins to occur. So, when I see a patient in the emergency room with a stroke I don’t know how much of their weakness is due to silent parts or dead parts. So what I do is give them the treatment that they need provided I have time.
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