What is an arrhythmia (dysrhythmia) ?
Normally human heart beats like the ticking of a clock (at very regular intervals). Any irregularity in this is called an arrhythmia, also sometimes called dysrhythmia. Each normal beating of heart involves two cycles of activity. First is an electrical activity and the second is a mechanical activity. These cycles originate from the upper chambers (atria) and spread to the lower chambers (ventricles).
