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ANSWER: For Each Minute Your Brain Does Not Receive Oxygen, Your Chances Of Living Gets Reduced So A persons brain can live for about 7 Minutes without oxygen Edit Share to:
He has been in a coma for 2 days and is on a life support machine. The only sign of any brain activity so far is that he is taking some independent breaths. How long can someone go without oxygen before there is brain damage ? If someone has been without oxygen for 15 minutes is there any hope that they can wake from a coma without any brain damage. If there is brain damage, is it always severe or does it depend on each patient ?