Skeptics say they are concerned that the introduction of the first external heart defibrillator, HeartStart Home, available without a prescription, could cause more problems than it prevents. Proponents say the proper use of the heart-shocking devices in homes could save the lives of 40,000 people per year, but critics fear the devices could delay calls to 911 and that they could cause people to ignore the importance of CPR and getting oxygen quickly to vital organs.

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