There is a medical expert on television discussing the latest advances in implantable cardioverter-defibrillators. What is this device used for?

An implantable cardioverter-defibrillator (ICD) monitors the heart’s electrical activity and can deliver an electrical shock to stop dangerous abnormal rhythms. It is used to treat life-threatening heart rhythms, not to remove an embolism, widen an artery, or lower blood pressure.

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