When someone is declared brain dead, it means their entire brain, including the brainstem, has irreversibly stopped functioning, making them legally dead, even if machines keep their heart beating and lungs breathing temporarily. This is a permanent state with no chance of recovery, unlike a coma, where some brain activity remains. Key signs include no response to stimuli, fixed pupils, no gag reflex, and inability to breathe without a ventilator, with diagnosis confirmed by specific tests.
There are a number of criteria for diagnosing brain death.
a person must be unconscious and fail to respond to outside stimulation. a person's heartbeat and breathing can only be maintained using a ventilator. there must be clear evidence that serious brain damage has occurred and it cannot be cured.
Occasionally, a person's limbs or torso (the upper part of the body) may move after brain stem death has been diagnosed. These are spinal reflex movements generated by the spinal cord, and don't involve the brain at all. They'll not affect a diagnosis of brain stem death.
Once the decision to proceed with the brain death determination has been made, three conditions must be present: coma, the absence of brainstem reflexes, and apnea.
This means they will not regain consciousness or be able to breathe without support. A person who is brain dead is legally confirmed as dead. They have no chance of recovery because their body is unable to survive without artificial life support.
Brain death is defined as the irreversible loss of all function of the brain, including the brainstem (see 10 N.Y.C.R.R. § 400.16). The three essential findings in brain death are coma, absence of brainstem reflexes, and apnea.
In brain death, you don't have reflex responses. Likewise, comas aren't always permanent. Most people emerge from comas within two weeks. In brain death, a person never regains consciousness due to permanent loss of brain function, which is completely irreversible.
Continuing artificial life support for patients who are brain dead may produce harm to patients, families, and others involved. Declaration of brain death should not be delayed to wait for families or to justify hospital care. Instead, appropriate family care should be provided after the death declaration.
In plain terms, current diagnostic methods yield false positive results — physicians declare patients dead who are not in fact dead. In these cases, it is more accurate to diagnose that the patient suffered a profound brain injury rather than total loss of all neurological functioning.
When the brain dies, the person cannot move, breathe, think or feel. Pain or suffering cease. Brain death is death, and cannot be reversed. The heart can continue to beat for awhile as the ventilator (breathing machine) provides oxygen to the body.
Stages of brain death
The diagnosis of brain death is primarily clinical. No other tests are required if the full clinical examination, including each of two assessments of brain stem reflexes and a single apnoea test, is conclusively performed.
The heart continues to beat while the ventilator delivers oxygen to the lungs (the heart can initiate its own beating without nerve impulses from the brain) but, despite the beating heart and warm skin, the person is dead. Since the brain has stopped working, the person won't breathe if the ventilator is switched off.
Therefore, CT and MRI features associated with brain death can be important for identifying catastrophic brain injury consistent with cerebral circulatory arrest. However, imaging fi ndings cannot be used to diagnose brain death in the absence of clinical evidence.
Several years ago, the autopsy report of a totally brain-dead patient named TK who was kept on life support for nearly twenty years was published in the Journal of Child Neurology. He remains the individual kept on life support the longest after suffering total brain failure.
Brain death is death. Physicians at hospitals across the nation make the determination, or declaration, that a patient has died before that individual can become an organ donor.
A deceased organ donor is kept on a ventilator after she/he has been declared brain-dead. They will remain on the ventilator until necessary approvals are taken and the organs can be retrieved. A Brain stem Dead person's organs may stay alive for a period of time that may range from a few days to a few weeks.
There is no rule about how long a person can stay on life support. People getting life support may continue to use it until they either recover or their condition worsens. In some cases, it's possible to recover after days or weeks of life support, and the person can stop the treatments.
For example, the standard definition of a person's death is of 'an individual who has sustained either… irreversible cessation of circulatory and respiratory function, or irreversible cessation of all functions of the entire brain…' (e.g., see the first page of this chapter).
In many cases, brain death is caused by a sudden accident or injury. A healthcare professional will talk with you about certain decisions you need to make at this time. Among those decisions may be the possibility of organ and/or tissue donation.
Neuroscientists have recorded the activity of a dying human brain and discovered rhythmic brain wave patterns around the time of death that are similar to those occurring during dreaming, memory recall, and meditation.
They do not hear or feel anything, including pain. This is because the parts of the brain that feel, sense, and respond to the world no longer work. In addition, the brain can no longer tell the body to breathe. Because the brain cannot control breathing, breathing must be done by a machine, called a ventilator.
Permanent brain damage begins after only 4 minutes without oxygen, and death can occur as soon as 4 to 6 minutes later. Machines called automated external defibrillators (AEDs) can be found in many public places, and are available for home use.
No, a patient who is brain dead will not be able to recover. The body may continue to breathe with mechanical support but eventually, both the breathing and heart will stop even with continued support. Being brain dead is not the same as being in a coma or a prolonged vegetative state.
The Last Stages of Life