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Defibrillation
Stopping ventricular fibrillation with an electric shock. This can be achieved by medical personnel at the scene of a cardiac arrest, using paddles placed on the chest, or automatically by a device implanted in the patient (an ICD).
Defibrillator
An external or implanted device that can deliver a shock to the heart. It is used to treat abnormally fast and irregular heart rhythms.
Demand
a type of pacemaker that paces only when necessary; i.e., when the heart’s own intrinsic rate becomes slower than the rate at which the pacemaker is programmed to operate.