The majority of brain dead patients’ bodies can still live no more than a week, people have breathing and heartbeat to live, if the heartbeat stops, breathing will also stop in a minute or so, breathing first, it takes a few minutes for the heart to stop beating completely, without breathing and heartbeat the body can no longer continue to live. The brain of a brain-dead patient is severely damaged, and there is no way to reverse any treatment. The respiratory center in the medulla oblongata of the brain loses its function and stops working, and the person is not breathing, but the heart is still beating. One statistic shows that even with adequate support from a ventilator, 97% of brain dead patients will experience cardiac arrest within a week.