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No, a defibrillator does not simply restart a completely stopped heart. An automated external defibrillator (AED) analyses the electrical activity of the heart and delivers a shock only when it detects a heart rhythm that can benefit from defibrillation. The shock is designed to interrupt certain dangerous abnormal electrical rhythms, giving the heart's normal electrical activity an opportunity to resume. If someone is unresponsive and not breathing normally, call 999, start CPR and use an AED a …