Explain the mysterious phenomenon of

When the heart stops beating, processes leading to death have only just begun. In some cases, hypothermia may slow these processes.

Decode the "dead person" phenomenon

Neysi Perez girl in Honduras suddenly woke up and scratched the coffin to call for help after being buried not long ago. She was taken to the hospital but the doctor once again confirmed that she was dead. The hospital side said that after hearing a gunshot, Perez had a strong psychological shock that temporarily stopped her heart. Extremely tense causes her body to be paralyzed and her muscles cannot perform basic functions, so doctors determine she is dead and issue death certificates to her family.

Researchers have recorded many cases of "returning from death".(Artwork: Thinkstock)

Many unexpected cases resurrected in morgues or called for help in coffins once recorded in the world.

Last year, a 91-year-old woman in Poland suddenly regained consciousness in the morgue after 11 hours of " death " and was preparing to be buried by her family. In Liberia, an Ebola patient is found to be alive when medical workers take cremation.

Death is the cessation of a number of different processes and mechanisms of action in the body, from heartbeat to nerve cells. When some mechanisms have stopped, others can still work. According to scientists, this is the main reason that some brain-related situations become complex and the definition of death is not entirely clear. It can be interpreted in different ways, culturally or scientifically.

Often, processes that lead to death begin when the heart stops beating. The body in the body uses up all the oxygen and other important nutrients, while accumulating toxic waste. This process begins at the individual cellular level, extending to the lungs, muscles, kidneys and, ultimately, all organ systems. The brain is especially sensitive to hypoxia, so within 4-6 minutes of lack of oxygen, nerve cells will die slowly.

A hypothesis that can explain the sudden " resurrection" is the cooling process in the morgue. It may slow down the aforementioned processes and increase resilience quickly enough to make patients wake up.

The processes that lead to death start when the heart stops beating.(Artwork: ShutterStock)

It is possible that at the time of the doctor's examination, these patients fall into an unconscious state or an extremely weak pulse, so they are determined to be dead. According to neuroscience professor Stephan Mayer of Columbia University in the US, when the heart stops beating, the process of death is just beginning. Brain damage due to lack of oxygen will appear in stages.

Professor Lance Becker of the University of Pennsylvania said that when the body does not have oxygen, the entire signal will transmit information to the cells that it is time for the patient to leave. However, the " braking " chance may occur in patients with little or no brain damage due to hypothermia . This is the state where the body temperature falls a few degrees lower than the average body temperature of 37 degrees C.

If the temperature drops , the brain will need less oxygen and more energy. In brain surgery, the brain can be protected by cooling patients while they sleep with anesthesia.

To determine whether the heart is beating or not, medical staff can check the pulse in the wrist or carotid artery in front of the neck. Examining respiratory, eye, and light response can also provide important information about the patient's ability to survive .