I’m still reading Erasing Death: The Science That is Rewriting the Boundaries Between Life and Death, by the Anglo-American expert on cardiac-arrest resuscitation Sam Parnia, M.D., Ph.D. Dr. Parnia, a former fellow in critical care medicine at the Weill Cornell Medical Center in New York City, was an assistant professor of critical care medicine at the State University of New York and its director of resuscitation research at the time that this book was published in 2013.
Here’s another passage from the book:
Dr. Mario Beauregard, a Canadian neuroscientist, conducted a study with patients who underwent deep hypothermic circulatory arrest (DHCA) at Hôpital Sacré-Cœur, a research hospital affiliated with the Université de Montréal, between 2008 and 2010. These were patients who had been cooled down to an incredible 18°C (64.5°F) from 37°C (98.5°F), a point at which the brain stops working, and doctors can stop the circulation without causing permanent damage. The body is so cold that the cells have so little metabolic activity that even though they are starved of oxygen and there is no blood flow or circulation, they don’t become damaged. This gives surgeons time to safely operate on patients without any circulation. Biologically this is the same as what happens to someone who has died. This surgical procedure was employed in patients to repair aortic defects where they couldn’t have been placed on a heart-lung bypass machine. The main object of Beauregard’s study was to estimate the prevalence of conscious mental events during DHCA. Of the thirty-three patients whose cases were examined, three patients reported conscious mental activity and were interviewed for the study, and one reported having an out-of-body experience.