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Definition of Cardiac cycle
1. Noun. The complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles. "The cardiac cycle can be shown on an electrocardiogram"
Medical Definition of Cardiac cycle
1. The complete round of cardiac systole and diastole with the intervals between, or commencing with, any event in the heart's action to the moment when that same event is repeated. (05 Mar 2000)