Also: Prognostic irregular heartbeat
Prognostic (predictive) cardiac arrhythmia

Heart arrhythmias, also called cardiac arrhythmias, are irregular heart rhythms that result when the heart beats too fast, too slow, or unevenly. A heart arrhythmia occurs if there is a disturbance anywhere along the nerve signal pathway in the heart chambers. There are many different types of heart arrhythmias and some are more serious than others, causing heart attack or sudden death. Heart arrhythmias are treated with medications, electrophysiologic ablations, and surgically placed pacemakers or implantable cardioverter-defibrillators.