What is the equation for calculating ejection fraction?

The ejection fraction (EF) is a key measurement used to assess the heart's efficiency and its ability to pump blood. It is defined as the percentage of blood that is ejected from the left ventricle with each heartbeat. The correct equation for calculating ejection fraction is based on the relationship between stroke volume and end diastolic volume.

In this case, the equation states that EF is equal to the stroke volume divided by the end diastolic volume, multiplied by 100 to convert it into a percentage. Stroke volume refers to the amount of blood pumped by the heart during each contraction, while end diastolic volume is the total amount of blood in the left ventricle at the end of diastole, just before the heart contracts.

By using this equation, one can assess how effectively the heart is functioning. For instance, a reduced ejection fraction may indicate heart failure or other cardiac dysfunctions. It's important in clinical practice, especially when evaluating patients with cardiac conditions.

In contrast, the other provided choices involve incorrect calculations or interpretations. For example, one choice misplaces the stroke volume in relation to end systolic volume and another erroneously relates cardiac output to stroke volume. Understanding the correct components involved in ejection fraction