What is an Automated External Defibrillator? If you haven’t heard by now, an AED is a medical device that is designed to restore a normal heartbeat to a distressed individual by sending a corrective electric pulse to their heart. It may be used to stop or correct an arrhythmia, which is a heartbeat that is irregular, too slow, or too fast. Though it may seem intimidating at first, these devices have been tailored for public use and require minimal training. Many health and safety-conscious companies are placing defibrillators in their workspaces, so read on and learn how to use an …