Heart failure with preserved ejection fraction (HFpEF), also called diastolic failure (or diastolic dysfunction): The left ventricle loses its ability to relax normally (because the muscle has become stiff). The heart can't properly fill with blood during the resting period between each beat.

What is the difference between diastolic dysfunction and congestive heart failure?

When heart failure is accompanied by a predominant or isolated abnormality in diastolic function, this clinical syndrome is called diastolic heart failure. Diastolic dysfunction refers to a condition in which abnormalities in mechanical function are present during diastole.

Is grade 2 diastolic dysfunction considered heart failure?

This is the mildest form of diastolic heart failure and is referred to as an abnormal relaxation pattern. Patients are usually asymptomatic. Grade II – This diastolic dysfunction is characterized by increased filling pressure in the atrium and is considered to be moderate stage disease.