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Human brain still conscious minutes after heart stop beating: Study

Independent   

28 February, 2018 21:48 PM



Human brain still conscious minutes after heart stop beating: Study

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Neurologists studying the brains of nine patients as they died have found surprising information that contradicts what we thought we knew about dying.

According to the new study, death is marked not by the beating of your heart, but by a final wave of electrical activity in our brains called “spreading depression.”

This “spreading depression” is a final flurry of activity that occurs in the brain before the final fatal shutdown of the organ, according to the experts.

The findings mean that for as long as three to five minutes after a human heart stops beating or ceases to show signs of life, the brain is still conscious.

The study, which was carried out by a team of neurologists including some from the Charité–Universitätsmedizin Berlin, followed nine patients with devastating brain injuries who had Do Not Resuscitate orders.  

By analysing electrical signals in their brains as they died, the researchers hoped to find new information about the timeline of dying - and they have. 

Through the use of electrodes planted in the brains of the patients, the neurologists discovered that even after the heart stops beating, cells and neurons in the brain continue to function.

And it isn’t until the “spreading depression” that these neurons cease activity - minutes after the heart has stopped pumping blood and oxygen through the body.

Immediately after the neurons frantically attempt to receive fuel, they shut down for good - possibly.

Apparently, scientists aren't even convinced this event is the last moment of life - which is both scary and fascinating. 

According to researchers, the debate for when death is truly final is still up for debate, as Dr Jed Hartings of the University of Cincinnati’s College of Medicine and a member of the research team told Newsweek: “The chemical changes that lead to death begin with depolarization.

“We’ve never had a method to diagnose brain death, and we don’t have a way to be certain when all capacity for awareness is lost.”

But the new research is important because it can be used to determine how long it is possible to resuscitate before irreversible damage has been done to the brain.

The findings could also influence “treatment strategies of cardiac arrest and stroke that may complement efforts to reestablish circulation, but also the debate on organ donation after cardiocirculatory death, where death is declared between two and 10 minutes following the cessation of circulatory function,” according to the published findings in the journal Annals of Neurology.

As of now, scientists believe that if circulation resumes even after five minutes, the person could partially recover. 


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