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A dual chamber pacemaker paces the atrium and ventricle. A biventricular pacemaker paces both ventricles. An implantable cardioverter-defibrillator can function as a pacemaker would. In addition, if it detects ventricular tachycardia or fibrillation, it sends out a shock to reset the heart to a normal rhythm.

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implantable cardioverter-defibrillator (ICD) is a small battery-powered electrical impulse generator which is implanted in patients who are at risk of sudden cardiac death due to ventricular fibrillation and ventricular tachycardia

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nice St. Jude Medical recalls Implantable Cardioverter Defibrillators and Cardiac Res... Euro Media

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Implantable cardioverter-defibrillator (ICD) is a small battery-powered electrical impulse generator that is implanted in patients who are at risk of sudden cardiac death due to ventricular fibrillation and ventricular tachycardia. It detects cardiac arrhythmia and correct it by delivering a jolt of electricity. Ability to revert ventricular fibrillation. Can include both atrial and ventricular arrhythmias. Can perform biventricular pacing for congestive heart failure or bradycardia.

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