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Intermountain Healthcare answeredA pediatric pacemaker is a small device that corrects your child's heart rhythm. Your child's heart has a natural pacemaker called the sinus node -- a cluster of cells that sends electrical impulses to make the heart beat. The electrical impulses move down through the heart, and are sent to the heart's pumping chamber through the atrioventricular node. If the sinus node or atrioventricular node doesn't work properly, an artificial pacemaker can keep your child's heart beating at the right pace.