An arrhythmia is an irregular or abnormal heartbeat. A heart arrhythmia may occur when the electrical impulses that control the beating of the heart don’t work properly, causing the heart to beat too slow, too rapidly, or irregularly. While most arrhythmias are harmless, they may be an indication of a serious underlying condition, such as heart disease or a lack of blood flow to the heart. Heart arrhythmias are not uncommon and may be congenital or caused by various factors. Treatment for a heart arrhythmia varies depending on the severity and underlying cause of the arrhythmia. Mild heart arrhythmias may require no treatment at all. A bradycardia, or slow heart beat, may be treated with a pacemaker to stimulate the heart to beat at a steady rate. A pacemaker is a small device, implanted under the skin near the collarbone, that sends out electrical impulses through the blood vessels to the heart. Other treatments for heart arrhythmia include: medication, catheter ablation, cardioversion, implantable cardioverter defibrillator. In some cases, surgery may be performed to treat arrhythmia, often for cases caused by heart disease. Coronary artery bypass surgery may be performed to improve blood supply to the heart, while valve repair surgery may correct an arrhythmia as well.