From reading the article (and related articles) it doesnt seem that three hours is the "deadline." That's just how long they waited before reviving the dogs. Who knows how long this could last? And as for the brain cells dying, thats what they hoped to address in this study. They think the cold salt water saline solution just puts it into hibernation, much like insects that hibernate for hundreds of years and then "wake up."
That begs the question.....what if someone "accidently" woke them up?
EDIT to clarify: Not hibernation like in bears, which require their body to burn energy to supply the brain. Hibernation in that the cells no longer "eat" (mitochondria) or reproduce.. they just.. sit there.
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