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brain and oxygen

how long can the brain go w/out oxygen,before any damage
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I would like to know myself. I am flying from PA to Tulsa because my nephew who is 17 fell through a glass window. He cut two main arteries, had transfusions, coded on them 4 times before the med evac helicopter got to him. He is on life support and will not wake up. It has been a week..... a very long week. They turn the ventalator down to see if he can breathe on his own but he just cant do it and despite all the efforts he just will not wake up.... Anyone have any advice or comments to add? I would sincerely appreciate your comments.  ***@****
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lack or no oxygen for 3-4 minutes can result in permanent brain damage
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