Is it enough with a heart that doesn’t beat anymore even if there still is brain function? How are we medically sure that even if there is no brain function someone is dead?
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Heartbeat isn’t the best indicator of death, because it isn’t terribly uncommon for the heart to start beating again if medical care gives the patient a fighting chance. Brain death is a better indicator that someone is definitely gone.
There are diagnostic tests that can be performed to determine brain death. Many of these measure reflexes that are very rarely absent or lost, except in cases of irreversible damage to parts of the brain that are absolutely necessary for survival.
No test is perfect, but these are very good.
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