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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.
A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate.Pacemakers are used to treat arrhythmias (ah-RITH-me-ahs). Arrhythmias are problems with the rate or rhythm of the heartbeat.acemakers can: 1  Speed up a slow heart rhythm. 2  Help control an abnormal or fast heart rhythm. 3  Make sure the ventricles contract normally if the atria are quivering instead of beating with a normal rhythm (a condition called atrial fibrillation).