JACC Journals › JACC: Heart Failure › Archives › Just Accepted Methodology and Mechanisms Corner : JACC: Heart Failure Just Accepted Heart failure with preserved ejection fraction (HFpEF) is defined as signs and symptoms of heart failure (related to increased left ventricular filling pressures at rest or during exercise) in a patient with an ejection fraction ≥50%, following the exclusion of other disorders (ie, HFpEF mimics), which include cardiac amyloidosis, valvular heart disease (eg,...