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Palliative care doctor Kathryn Mannix has compared the process of dying to the discharge of a phone battery. A factor that harms the body leads to energy depletion. This can happen almost instantly in the case of injury, or last for months in the case of natural death, the magazine World of Science: Interesting Things Around Us reported.
The body stops taking in food, physiological processes gradually slow down, and drowsiness occurs. The penultimate stage is the erasure of the boundary between sleep and wakefulness. In conditions of acute energy deficiency, the body "turns on" a protective reaction and suppresses consciousness. A person stops feeling pain. This is the so-called pre-throe state.
Throe is a desperate attempt by the nervous system to reboot the body. The body intensively burns ATP in the tissues. The heart rate is restored, breathing improves. Consciousness normalizes for several minutes.
The next stage is reversible clinical death. This is the period when the heart stops, and the cells are starved of oxygen and slowly die. However, metabolism does not end. It is carried out anaerobically and delays cell death.
It is believed that if a person regains consciousness within 5 minutes, the consequences for cognitive abilities will be minimal, and the patient will be able to return to normal life. However, according to the standards, resuscitation lasts 30 minutes.
Some circumstances can give doctors additional time. For example, severe hypothermia. Low temperature slows down the process of decay and increases the lifespan of nerve cells by up to 2 hours.
According to scientists from the Grossman medical center in New York, after cardiac arrest, a person remains conscious for another 30 seconds and, most likely, has time to assess the circumstances.
The brain structures themselves live for another 10 minutes. The temporal lobe is the last to shut down. Studies show that the patient can constantly hear what is happening around him. He can no longer consciously assess what is happening, but the higher nervous system responds to the tone of the voice.
Scientists from the University of British Columbia conducted a similar study. They measured the electrical activity of the brains of 30 people—both healthy and clinically dead—using electroencephalography. Short pieces of music were played to all of them. Their neural response was the same for different people.
The author of this study, Elizabeth Blundon, came to the conclusion that it is possible to talk to a dying person until the end. The brain will not analyze the incoming information, but “warm” intonations and comforting words will reach the addressee to a certain extent.
Scientists from the Karolinska Institutet noted that after cardiac arrest, the brain remains active for 3 minutes. It is at this moment that specific “death experiences” occur: the feeling of a soul flying above the body, a journey through a tunnel to a bright light, and meetings with deceased relatives or God.
These experiences are usually reported by people who have experienced clinical death. The overwhelming majority of them describe their experiences as pleasant. About 15 percent have experienced excruciating, hellish feelings.
According to researchers at the Johns Hopkins University School of Medicine, the hormones dopamine and serotonin are released in large quantities in the body during the near-death state.
To some extent, this is also a protective reaction, a natural painkiller that causes hallucinations and a feeling of euphoria. The images that patients see are associated with their personal religious beliefs and moods.