Similar term(s): dysrhythmia, irregular heart rhythm.
An arrhythmia (also called dysrhythmia or irregular heart rhythm) is an irregular or abnormal heartbeat.
An arrhythmia can involve a change in the rhythm, producing an uneven heartbeat, or a change in the rate, causing a very slow or very fast heartbeat.
Source:
Cleveland Clinic Heart Center
Treating the Heart, Blood Vessels and Circulation
Ventricular fibrillation, for instance, is one of several conditions known as "arrhythmias".
Source: GreenFacts
Circulatory system - Pacemaker - Ventricular fibrillation
GreenFacts Summary on Static Fields: