Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction.

Synonyms: Cardiac Dysrhythmia, Arrhythmia, Cardiac, Cardiac Arrhythmia, Arrythmia, Arrhythmia, Dysrhythmia, Cardiac, Arrhythmias, Cardiac, Cardiac Arrhythmias