Assertion: external defibrillator | /r/CapableOf | seek to stop the arrhythmia
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text: An automated external defibrillator or AED is a portable electronic device that automatically diagnoses the potentially life threatening cardiac arrhythmias of ventricular fibrillation and ventricular tachycardia in a patient, and is able to treat them through defibrillation, the application of electrical therapy which seeks to stop the arrhythmia, allowing the heart to reestablish an effective rhythm.