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Sometimes devices equivalent to pacemakers, known as implantable cardioverter-defibrillators (ICDs) are implanted. These gadgets are regularly used within the remedy of patients at danger from sudden cardiac demise. An ICD has the potential to treat many types of coronary heart rhythm disturbances through pacing, cardioversion, or defibrillation. Some ICD devices can distinguish between ventricular fibrillation and ventricular tachycardia (VT), and may try to pace the heart quicker than its intrinsic rate inside the case of VT, to try to interrupt the tachycardia before it progresses to ventricular fibrillation. This is called rapid-pacing, overdrive pacing, or anti-tachycardia pacing (ATP). ATP is best powerful if the underlying rhythm is ventricular tachycardia, and is by no means powerful if the rhythm is ventricular fibrillation.