40 ef54 is what grade of heart failure An Ef value of 54% is a grade of heart failure and cannot be generalized; it may be normal or it may be heart failure with preserved ejection fraction. Ef value, also known as ejection fraction, is the ratio of the heart’s ejection per beat to the ventricular end-diastolic volume, related to the contractile function of the heart, mainly reflecting the pumping function of the left ventricle, and one of the most important indicators for assessing heart failure, the normal range is generally 50% to 70%, but due to the difference in equipment, its reference value may be slightly different. When Ef <40%, it suggests the presence of heart failure, mainly caused by cardiac systolic dysfunction, such as dilated cardiomyopathy. When Ef >50%, heart failure is also possible, such as hypertrophic cardiomyopathy, which is an ejection fraction preserved heart failure with diastolic dysfunction. an Ef between 40% and 50% also suggests a decline in cardiac function, which is a heart failure with predominantly systolic insufficiency accompanied by diastolic dysfunction. Therefore, when the Ef value is 54%, it is not possible to determine whether there is heart failure and the classification of heart failure based on this one value, but should be combined with the patient’s underlying cardiac disease, the presence of heart failure symptoms, and so on. It is recommended to consult a doctor in time, and self-assessment of cardiac function is not recommended to avoid misunderstanding of the condition.