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The rules of how to treat cardiac arrest are being re-written at the Mayo Clinic in Minnesota. Technology, new drug treatments, conventional CPR and the use of hypothermia are now being coordinated with great affect - in one case reviving a man who'd been clinically dead for more than an hour. (Video Transcript) Rodney Whitmore is exercising in the physical therapy wing at the Mayo Clinic in Rochester Minnesota. It's part of his recovery regimen. Two months ago in his farm house, Rodney went into cardiac arrest. His heart stopped pumping blood and supplying oxygen to his body. Statistically, Rodney's...

You can skip the mouth-to-mouth breathing and just press on the chest to save a life. In a major change, the American Heart Association said Monday that hands-only CPR - rapid, deep presses on the victim's chest until help arrives - works just as well as standard CPR for sudden cardiac arrest in adults. Experts hope bystanders will now be more willing to jump in and help if they see someone suddenly collapse. Hands-only CPR is simpler and easier to remember and removes a big barrier for people skittish about the mouth-to-mouth breathing. "You only have to do two things....