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Who Needs a Pacemaker? You have heart muscle problems that cause electrical signals to travel through your heart muscle too slow. (Your pacemaker will provide cardiac resynchronization therapy for this problem.) You have had a medical procedure to treat an arrhythmia called atrial fibrillation. A pacemaker can help regulate your heartbeat after the procedure. You often faint due to a slow heartbeat. For example, this may happen if the main artery in your neck that supplies your brain with blood is sensitive to pressure. In you have this condition, just quickly turning your neck can cause your heart to beat slower than normal. When that happens, not enough blood may flow to your brain, causing you to faint. Pacemaker may be helpful if: The electrical signals between your heart's upper and lower chambers are partially or completely blocked or slowed down (this is called heart block). Aging, damage to the heart from a heart attack, or other heart conditions can prevent electrical signals from reaching all the heart's chambers. You need to take certain heart medicines (such as beta blockers), but these medicines slow down your heartbeat too much. Aging or heart disease damages your sinus node's ability to set the correct pace for your heartbeat. Such damage can make your heart beat too slow, or it can cause long pauses between heartbeats. The damage also can cause your heart rhythm to alternate between slow and fast. Source: National Heart Lung and Blood Institute, U.S. Department of Health and Human Services, National Institute of Health. nhlbi.nih.gov