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Anonymous users2024-02-12According to the starting point of the irreversible cessation of the functions of the three vital organs of life, the whole brain, heart and lungs, people can divide death into brain death, cardiac death and lung (respiratory) death. Brain death is different from "vegetative", "vegetative" brainstem function exists, coma is only due to severe damage to the cerebral cortex or in a state of sudden inhibition, the patient can have spontaneous breathing, heartbeat and brainstem response, while brain death has no spontaneous breathing, is permanent and irreversible. In the past, many countries have used "cardiac arrest" and "loss of breathing" as the criteria for death.
However, with the development of medical technology, patients' vital signs such as heartbeat, breathing, and blood pressure can be reversed or maintained for a long time through a series of drugs and advanced equipment. But if there is structural damage to the brainstem, nothing can be saved by any medical treatment. Therefore, compared with cardiac death, brain death appears to be more scientific and the criteria are more reliable.
This phenomenon of separation of brain function from heart and lung function has prompted people to re-understand the concept of death. The essence of death should mean that the function of the body as a whole under the control of the central nervous system has been permanently lost, and this is marked by brain death. After brain death, it will not come back to life, but this diagnosis of "brain death" should be absolutely correct.
If the diagnosis is wrong, there is a chance that the person will come back to life. There is a strict procedure for declaring brain death, and there are many tests to be carried out, and after the declaration, it is necessary to wait 12 hours for confirmation. Notice that each of those tests is essential.
It is not a miracle that a person who has been declared dead has come back to life, it is a misdiagnosis by a doctor. After brain death, the electrical potential in the heart can keep the organs active for a short period of time, and in fact the heart can beat outside the body. But without a ventilator to keep blood and oxygen flowing, the heart stops beating for a short time.
When a ventilator is present, some biological processes including the kidneys and stomach can sustain working for a week. After brain death, the body will no longer secrete important hormones to maintain some physiological functions, including stomach, kidney, and immune function, and they will not function for more than a week. For example, thyroid hormone regulates the body's metabolism, and antidiuretic hormone keeps the kidneys hydrated.
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Anonymous users2024-02-11Brain death is the standard of death in modern medicine, and after brain death, it is considered impossible to resurrect.
A brain-dead person is declared dead in a foreign hospital and medical treatment is stopped. In our country, heart death is regarded as death, and as long as the family does not give up medical treatment, the hospital will continue to use ventilators and drugs to maintain the signs of life until the patient dies of heart and lung organ failure.
The human brain is composed of six parts: medulla oblongata, pons, midbrain, cerebellum, diencephalon and telencephalon, and the medulla, pons and midbrain are collectively called brainstem. The body's respiratory center is located in the brainstem, so impaired brainstem function can directly lead to respiratory arrest. Cells in some parts of the body can regain function by regenerating after being injured, but nerve cells are different:
Once necrotic, it is difficult to regenerate.
In the past, many countries have used "cardiac arrest" and "loss of breathing" as the criteria for death. However, with the development of medical technology, patients' vital signs such as heartbeat, breathing, and blood pressure can be reversed or maintained for a long time through a series of drugs and advanced equipment.
But if there is structural damage to the brainstem, no amount of medical treatment can save the patient's life. Therefore, compared with cardiac death, brain death appears to be more scientific, and the standards are more reliable and standardized.
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