"Scientists studied the heart and brain activity of rats in the moments before the animals died from lack of oxygen and found that the animals’ brains sent a flurry of signals to the heart that caused irrevocable damage to the organ, and in fact caused its demise. When the researchers blocked these signals, the heart survived for longer...
In the rats, the brain and heart activity remained synchronized until the heart went into a state called ventricular fibrillation, in which the lower chambers of the heart quiver instead of contracting properly, preventing the heart from pumping blood.
But when the researchers blocked the flow of these chemicals from the brain to the heart, by severing the rats' spinal cords before killing them, it delayed ventricular fibrillation. As a result, the animals survived for three times as long as the rats whose heart-brain connection was left intact...
If researchers can find a way to "sever" the connection between the brain and the heart using drugs (rather than by actually severing the actual spinal cord), then it could be possible to administer these drugs to a person experiencing cardiac arrest. This would give health care workers more time to treat these patients, Borjigin said."
See: http://news.discovery.com/human/health/near-death-experiences-what-happens-in-the-brain-before-dying-1504071.htm
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