How does electrical stimulation of the heart coordinate the cardiac cycle again?

Reset own pacemaker. Assuming query is about cardioversion. There are hierarchies of pacemaker cells in the heart. Fastest one usually takes over. Normal sinus node, then av node or "junction", then purkinje or ventricular pacemakers, in that approximate order. If there is a rhythm disturbance involving a faster abnormal rhythm, an electrical pulse carefully delivered can reset, and allow the fastest normal pacer.

Related Questions

How does electrical stimulation of the heart coordinate the overall cardiac cycle?

Millisecond timing. The 2 atria act as reservoirs for returning blood; the 2 ventricles are the "pumpers". The 4 chambers must be coordinated with millisecond timing to maximize the amount of blood pumped (cardiac output). This is done by a network of specialized cells which are found in tracts or bundles that conduct a micro-electrical current to time motion. A gross analogy: think of the distributor in your car. Read more...