Heart failure with preserved ejection fraction (HFpEF) is a form of congestive heart failure where in the amount of blood pumped from the heart's left ventricle with each beat (ejection fraction) is greater than 50%.[1] It was formally known as diastolic heart failure or diastolic dysfunction, as the deficit in function frequently relates to changes occurring during diastole.[2][3] Approximately half of people with heart failure have HFpEF, while the remainder display a reduction in ejection fraction, or heart failure with reduced ejection fraction (HFrEF).[1]