What phase does the heart enter at the start of diastasis?

Diastasis is the phase of the cardiac cycle that occurs after the rapid filling phase and before atrial contraction. It represents a period of slower filling of the ventricles, where there is minimal pressure differential between the atria and the ventricles. During this phase, blood flow from the atria into the ventricles continues but at a much slower rate compared to the rapid filling phase, which is characterized by the quick influx of blood into the ventricles due to the atrioventricular valves being open.

Understanding diastasis is crucial, as it indicates the transition in the diastolic phase of the heart cycle. In this phase, the blood volume in the ventricles increases, preparing for the next contraction without the influence of significant atrial push. This slow filling allows the heart to manage its volume effectively and ensures optimal function during the subsequent phases of the cardiac cycle.