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If a person suddenly collapses and is unconscious, or if you come across someone who is unconscious, any number of things may be wrong. In some cases, their heart may be beating, but beating too fast, or beating both too fast and in an irregular manner. In both cases, even though their heart is still beating, their body may not get enough oxygen. This can very quickly cause permanent brain damage or even death. In this course, you'll learn how to provide first aid to a person with an irregular heartbeat by using an automated external defibrillator, or AED.