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placed. Pacemakers do not prevent the heart from going to fast and abnormal heart rhythms can still occur. A defibrillator is a device similar to the pacemaker but larger. As previously stated, it can pace the heart and will prevent the heart from going too slow as well. However that is usually not the main reason defibrillators are placed.
1 If your ICD has a pacemaker feature when your heartbeat is too slow, it works as a pacemaker and sends tiny electric signals to your heart. 2  When your heartbeat is too fast or chaotic, it gives defibrillation shocks to stop the abnormal rhythm. 3  It works 24 hours a day.