Fração de ejeção

This calculator determines the left ventricular ejection fraction (EF), a measure that reflects how efficiently the heart pumps blood. By entering the systolic volume (SV) and the end‑diastolic volume (EDV), the algorithm performs EF = SV ÷ EDV × 100, returning a percentage. The result shows the proportion of blood ejected with each beat, which is essential for assessing cardiac function.

The calculation is based on simple physics: the volume ejected by the ventricle (SV) is divided by the total blood present before contraction (EDV). The resulting fraction is multiplied by one hundred to express it as a percentage. An EF of 55% therefore means that the ventricle ejects 55% of the volume that was in it at the end of diastole.

It is routinely used in echocardiography, cardiac magnetic resonance, and ventriculography, helping cardiologists monitor outcomes in patients with heart failure, cardiomyopathy, or post‑operative cardiac surgery. It also serves in clinical research to compare ventricular function across different populations.

Accuracy of the result depends on precise measurement of SV and EDV. Technical errors, variations in filling volume, or loading conditions can alter the value. EF should always be interpreted together with other clinical and laboratory findings, avoiding decisions based solely on this figure.