Heart arrhythmia is also called a cardiac dysrhythmia or irregular heartbeat. Heart arrhythmia is a condition where the heartbeat may vary (irregular, too fast or too slow).Heart arrhythmia includes extra beats, Supraventricular tachycardia, ventricular arrhythmias and Bradycardia. 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.