because they dont know
Newsweek or Time had a long story on a new method - brining the body temperature of the person down and then gradually reviving them.
There was some study that found trying to bring the heart back is what kill patients because cells are infused with oxygen too fast which triggers them to destroy themselves, something along those lines.
Problem is the geniuses can't agree on what method if any is workable
Google it, it will give you a pretty good answer
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