[Death criteria - now and in the future]

Death can be pronounced on both circulatory and brain criteria. In both cases, irreversible loss of brain function is essential in understanding finale death, as irreversible loss of breathing - a brainstem function - is mandatory. Brain function ceases irreversibly as a consequence of lack of blood supply to the brain, caused by circulatory arrest or by raised intracranial pressure. Brain function is central in death, which must be reflected in a future death criterion, stated in WHO´s new death criterion based on irreversible loss of capacity for consciousness and loss of brainstem function.