Brain Death is the complete and irreversible cessation of all functions of the entire brain, including the brainstem, and is recognized in medicine and law as Death of the individual even when cardiopulmonary function is maintained artificially. It results from catastrophic brain injury, commonly from severe traumat…
Brain Death is the complete and irreversible cessation of all functions of the entire brain, including the brainstem, and is recognized in medicine and law as Death of the individual even when cardiopulmonary function is maintained artificially. It results from catastrophic brain injury, commonly from severe traumatic brain injury, intracranial hemorrhage, or global hypoxic-ischemic damage, in which rising intracranial pressure halts cerebral blood flow and produces total neuronal loss. The defining feature is the permanent absence of cortical and brainstem activity, manifested as unresponsive coma with a known irreversible cause, absence of all brainstem reflexes, and apnea, meaning no spontaneous respiratory drive despite an adequate rise in carbon dioxide. Determination follows a rigorous clinical protocol that first excludes confounders such as hypothermia, severe metabolic disturbance, and central nervous system depressants, then documents coma, tests brainstem reflexes including pupillary, corneal, oculocephalic, oculovestibular, gag, and cough responses, and performs a formal apnea test; ancillary studies demonstrating absent cerebral blood flow or electrical activity may be used when clinical testing is incomplete. The diagnosis carries profound clinical, legal, and ethical significance, establishing the time of Death, guiding decisions to discontinue organ support, and providing the basis under which deceased organ donation may proceed within established consent and procurement frameworks.
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