Automatic External Defibrillators (or AEDs) are life-saving medical devices that can detect certain abnormalities in the way a person's heart is beating, and deliver electrical shocks to the heart to restore a normal heart beat. These devices are used in emergencies by physicians, nurses, emergency responders, and even bystanders on patients who have collapsed due to sudden cardiac arrest. At FDA, electrophysiologists, software engineers and other scientists help ensure that AEDs are safe and effective. For more on automatic external defibrillators and other medical devices, visit http://www.fda.gov/medicaldevices
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