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Defibrillators Are Although automated external defibrillators (AEDs) were invented in the 1980s, technological ad-vances have led to the development of more compact, portable versions. AEDs are safe for trained lay rescuers to treat sudden cardiac arrest because the devices automatically analyze the heart rhythm and only allow an electric shock when necessary. AEDs are easy to use, compact, battery-operated, lightweight and durable.
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