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There is no fixed number of times an automated external defibrillator (AED) can be used on a person during a cardiac arrest. If the AED continues to detect a shockable heart rhythm, it may advise more than one shock during the same emergency. The important thing is not to count the shocks. Keep following the AED’s instructions, continue CPR when told to do so and allow the device to decide whether another shock is needed. An AED analyses the person’s heart rhythm before every shock. …