Your heart has an electrical system that controls each heartbeat and signals your heart to pump blood. The signal starts in the top chambers of the heart and moves to the bottom chambers. The signal repeats with each heartbeat. The heart has 2 upper chambers called atria and 2 lower chambers called ventricles. These chambers beat in a coordinated way when the heart is healthy. This lets the heart pump blood effectively to the rest of the body. You have an arrhythmia if the electrical signals do not flow as they should, go the wrong way, or are blocked. When this happens, your heartbeat becomes too fast, too slow, or is not regular. Then the heart does not pump blood out to the body as well as it should. Treatment of abnormal heartbeats depends on the cause. Choices may include drugs or lifestyle changes. Sometimes, you may need surgery to place a pacemaker or other devices that keep the heart beat normal. Other times, you may not need any treatment.