The diastole is the period of relaxation in the cardiac cycle which alternates with systole. During diastole, the ventricles fill and the aortic and pulmonary valves are closed.

Cardiology is a medicine sector that covers the clinical study, treatment and imaging of the heart actions and diseases.

See also Ischemia, Calcium Score, Cardiac Phase, Diastole, Adventitia, Defibrillator, ECG Trigger, Arrhythmia Rejection.