Automated External Defibrillator Benefit patients who experience a sudden case of heartbeat arrhythmias. In these instances Defibrillators are an important tool for anyone in the vicinity of a victim suffering from ventricular arrhythmia as well. Instead of being alerted by the patient that her heartbeat is becoming irregular, ventricular arrhythmia renders the patient unconscious. the heart may beat too fast, too slow or an irregular mix of both. The anticipated outcome of sucharrhythmias is either cardiac arrest or a stroke.