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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 device that administers electrical energy to the heart to stimulate contraction and regulate its rhythm. Pacemakers may be permanent or temporary (e.g. transcutaneous, transvenous or epicardial wires).The essential components of a pacemaker are: 1  Pulse generator (the power source).nd letter: Chamber sensed â dual chamber (atrial and ventricle). 3rd letter: Pacemaker response to a sensed event â dual response (can trigger or inhibit). Thus a pacemaker functioning in DDD mode can pace either or both the atria and ventricles.