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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 an electronic device that provides an electrical signal to make the heart beat when itâs own, built-in pacemakers fail. The anatomical, built-in pacemakers provide whatâs called the âintrinsicâ rhythm, and they can be disrupted by various conditions â ischemia for example, or by an MI.acemakers can be either temporary or permanent. The temporary pacemakers that we see in the MICU are made up of a control box and one single output wire leading to the inner wall of the RV (thus called a ventricular wire, or âV-wireâ), and provide simple rate control by pacing the ventricles.