Death is one of the most fascinating mysteries of mankind, mysteries many scientists are trying to decipher.
What happens in the brain when the blood ceases to be transported to him? A scientific study has brought forth clues about what is happening just before death. Contrary to what is generally believed, there is no exact moment of a life-to-death transition, according to the digi24.ro news site.
Death is a process, explains Sam Parnia, one of the world's reanimation specialists, who led the study at Stony Brook University of Medicine in New York. It is only after the vital organs stop showing signs of life that the cells begin to die, and this may take several hours.
Just like some batteries, brain cells have electrical polarities and energy reserves. Missing oxygen and blood, the neurons first enter a "pause" mode. When the first cell succumbs, we say it is depolarizing, that is, releasing its entire energy reserve. This shock causes the depolarization of a neighboring cell, which in turn releases its energy, and then the whole process propagates in the chain.
This massive wave is a true tsunami for the brain. Its physiological and anatomical structures, designed for functional cells, deteriorate. But this tsunami is, however, up to a certain point, reversible. The question is how we know when death becomes totally irreversible from a cellular point of view, says Professor Sam Parnia. If they act before this time, the cells can be restored. Refrigeration of the head, for example, keeps the cells and stops the accumulation of toxic chemical elements.
Jens Dreier's objective is to develop automated methods for detecting depolarizations. "To learn how to protect the brain in case of stroke or cardiac arrest, we must first understand how to protect it. Time plays an important role, "says the professor.
Coming back almost half a century ago, with artificial respiration and cardiac resuscitation, the science of reanimation has made millions of people approaching death come back to life. And their testimonies about this experience coincide, regardless of age, origin, religion: these people describe a sense of immense peace, the passage of a tunnel, a warm light and close ones who have died and meet them, explains Sam Parnia, according to digi24.ro .