Understanding Implantable Cardioverter Defibrillators (ICD)

The body generates electrical impulses that cause the heart to beat. In some people, those electrical impulses don't happen in a normal pattern, which can cause the heart to beat too slowly, too fast or irregularly. A very fast heartbeat can lead to ventricular tachycardia, a potentially life-threatening condition. In patients who are at risk for ventricular tachycardia, doctors often recommend an implantable cardioverter defibrillator or ICD.

Disorders in the heart's electrical system can lead to arrhythmias, or an abnormal heart rhythm. Some arrhythmias can be life threatening and require an electrical shock to return the heart to a normal rhythm. Patients who are at risk for sudden cardiac death may require an implantable cardiac defibrillator or ICD, which can deliver a life-saving shock if the heart starts to beat too fast or in a chaotic pattern.

An ICD is a battery-powered device placed under the skin, just below the collarbone, or in your abdomen (stomach area) beneath your ribs. It reads the electrical signals in your heart to keep track of your heart rate. If the ICD detects an abnormal heart beat, it can deliver an electric pulse or shock to your heart. This helps restore a normal heartbeat. © AHA