Cardiac Arrhythmias also called cardiac dysrhythmia or irregular heartbeat. It is a condition in which the heartbeat is irregular, too fast, or too slow. It includes extra beats, supraventricular tachycardia, ventricular arrhythmias, and Brady arrhythmias. Many types of arrhythmia have no symptoms. When symptoms are present these may include palpitations or feeling a pause between heartbeats. More seriously there may be light headedness, passing out, shortness of breath, or chest pain, some predispose a person to complications such as stroke or heart failure. Others may result in cardiac arrest.