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Implantable Converter Defibrillators and Biventricular Pacing

At NewYork-Presbyterian Hospital, we offer the full complement of cardiac rhythm management diagnostic and therapeutic interventions, utilizing the most advanced equipment and techniques. Implantable converter defibrillators (ICDs) and biventricular pacemakers are devices that correct abnormalities in the heart's rhythm.

Implantable Converter Defibrillators

An implantable converter defibrillator (ICD) is a small device that is similar to a pacemaker. It is implanted under the skin, most often in the chest. An ICD senses the rate of the heartbeat; it delivers small electrical impulses to regulate a heart rate that is too fast, too slow, or irregular. All newly implanted ICDs can also function as a pacemaker that continuously regulates heart rhythm.

Biventricular Pacing

Biventricular pacemakers are implantable devices that are used to synchronize the beating of the two ventricles of the heart. Because the biventricular pacemaker is used to re-synchronize the rhythm of the ventricles, this treatment is called cardiac resynchronization therapy.

In the healthy beating heart, both upper chambers (atria) beat together, and both lower chambers (ventricles) beat together. In approximately one-third of patients with congestive heart failure, the right and left ventricles of the heart do not beat together. These individuals with congestive heart failure may be at risk for abnormal heart rhythms that can lead to sudden death. For this reason, the biventricular pacemaker is especially useful in treating congestive heart failure; biventricular pacemakers can be combined with ICDs for patients at risk for life-threatening arrhythmias.

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