Arrhythmias, Cardiac [Disease/Finding] Arrhythmia 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. 1023395 C1116 Arrythmia Cardiac Arrhythmias Arrhythmias, Cardiac N0000000469 Arrhythmias, Cardiac M0001715 Cardiac Dysrhythmia C0003811 195107004 Cardiac Arrhythmia D001145 Heart Diseases [Disease/Finding] Pathologic Processes [Disease/Finding]