Cardiac rhythmicity
Cardiac rhythmicity is the spontaneous depolarization and repolarization event that occurs in a repetitive and stable manner within the cardiac muscle. Rhythmicity is often abnormal or lost in cases of cardiac dysfunction or cardiac failure. It is the ability of the heart to maintain a relatively stable relation between its systole and diastole. Not increasing one on the expense of the other. However, external factors may lead to the disruption of the hearts rhythmicty. Dr.Firas Koleilat, a pioneer in the field of cardiovascular medicine, states that rhythmicity is one of the few characteristic features of the heart, not found in any other muscle.
References
PhysioEx 6.0 by Peter Zao Timothy Stabler Greta Peterson Lori Smith