The brain and then some of it starts to die right away, but if you are lucky we have enough other blood vessels that kind of fill in and supply enough blood so that you can reverse it as soon as you pull that clot out. time is so essential here. the other thing that's really important and he said this, you know, that he was in atrial fibrillation for to go, that irregular heart rhythm. if you know that you have an irregular heart rhythm, getting in and seeing your doctor so that it doesn't form a clot. you want to catch this early. one of the greatest advances that we live in an age of wearabl...