The loss or deprivation experienced by a person when a loved one dies is known as Brain death.
Brain death (also called brain stem death) occurs when a person on artificial life support loses all brain function. This means that you cannot regain consciousness or breathe without assistance. A brain dead person is legally deceased.
For the diagnosis of brain death, he must have three conditions: persistent coma, no brainstem reflexes, and inability to breathe on his own. Coma is confirmed when painful stimuli do not cause the patient to open their eyes, speak, or move their limbs.
But without brain function, the body will eventually stop functioning unless there is medical intervention. A person on a ventilator appears to be breathing, but cannot breathe on their own. The heart usually stops within 72 hours, but it can continue to beat for "about a week," Barreras said.
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