<unk> <unk>  is a form of<unk><unk>  in which the<unk><unk>  – the percentage of the volume of blood ejected from the left ventricle with each<unk> beat divided by the volume of blood when the left ventricle is maximally filled – is normal, defined as greater than 50%; this may be measured by echocardiography or cardiac catheterization. Approximately half of people with<unk><unk>  have<unk><unk><unk> , while the other half have a reduction in<unk><unk> , called<unk><unk>  with reduced<unk><unk>  <unk> . Risk factors for<unk>  include hypertension, hyperlipidemia, diabetes, smoking, and obstructive sleep apnea.<unk>  is characterized by abnormal diastolic function: there is an increase in the stiffness of the left ventricle, which causes a decrease in left ventricular relaxation during diastole, with resultant increased pressure and/or impaired filling. There is an increased risk for atrial fibrillation and pulmonary hypertension. There is controversy regarding the relationship between diastolic<unk><unk>  and<unk> .
Heart failure with preserved ejection fraction
Ischemic cardiomyopathy
Diabetic cardiomyopathy
Hypertrophic cardiomyopathy
Dilated cardiomyopathy
Restrictive cardiomyopathy
Alcoholic cardiomyopathy
Amyloid cardiomyopathy