What is the formula for calculating ejection fraction (EF)?

Ejection fraction (EF) is a crucial measurement in assessing the heart's efficiency and performance. It represents the percentage of blood ejected from the heart's ventricles with each contraction. The correct formula for calculating ejection fraction is expressed as the stroke volume (SV) divided by the end-diastolic volume (EDV), multiplied by 100% to convert it into a percentage.

In this context, stroke volume is the amount of blood pumped by the heart during each beat, while end-diastolic volume is the total amount of blood in the ventricle just before contraction. By using the formula EF% = (SV/EDV) x 100%, you obtain the fraction of blood that is ejected relative to the total volume of blood available in the ventricle at its fullest point. This provides insight into how well the heart is functioning and how effectively it is able to pump blood.

Utilizing this formula is integral for clinical evaluations, especially in diagnosing and managing various cardiovascular conditions. The other formulas provided do not accurately represent the conventionally accepted method for calculating ejection fraction, which underscores the importance of understanding this core principle in cardiac sonography.