The Ejection Fraction Percentage (EF%) Calculator is a tool used to assess the efficiency of the heart’s pumping action. The ejection fraction refers to the percentage of blood that is pumped out of the left ventricle with each heartbeat. This value is a key indicator of heart health and is commonly used by medical professionals to evaluate heart function, particularly in patients with heart failure or other cardiovascular conditions.
The EF% is calculate using data from an echocardiogram or other imaging techniques that measure the amount of blood in the left ventricle during both the filling phase (End-Diastolic Volume, EDV) and after contraction (End-Systolic Volume, ESV). The EF% provides a valuable insight into how well the heart is pumping blood and helps determine the severity of heart conditions.
Formula of Ejection Fraction Percentage Calculator
EF (%) = (SV / EDV) × 100
Where:
- EF (%) is the Ejection Fraction Percentage
- SV is the Stroke Volume (the amount of blood pumped by the left ventricle in one contraction)
- EDV is the End-Diastolic Volume (the total amount of blood in the left ventricle at the end of the filling phase, just before contraction)
You can calculate Stroke Volume (SV) using the formula:
SV = EDV – ESV
Where:
- ESV is the End-Systolic Volume (the amount of blood remaining in the left ventricle after contraction)
General Terms Related to Ejection Fraction and Heart Function
This table provides key terms commonly used in discussions of heart function and ejection fraction, which may be helpful for users without needing to calculate them each time.
| Term | Definition |
|---|---|
| Ejection Fraction | The percentage of blood pumped out of the left ventricle with each heartbeat |
| Stroke Volume (SV) | The volume of blood pumped by the heart with each beat |
| End-Diastolic Volume (EDV) | The total volume of blood in the left ventricle before contraction |
| End-Systolic Volume (ESV) | The amount of blood remaining in the left ventricle after contraction |
| Normal EF Range | Typically 50-70% for a healthy heart |
Understanding these terms can help you better interpret the results from an EF% calculation and assess heart health.
Example of Ejection Fraction Percentage Calculator
Let’s walk through an example of calculating the Ejection Fraction Percentage for a patient:
- End-Diastolic Volume (EDV) = 120 mL
- End-Systolic Volume (ESV) = 50 mL
First, calculate the Stroke Volume (SV):
SV = EDV – ESV
SV = 120 mL – 50 mL = 70 mL
Now, calculate the Ejection Fraction (EF%):
EF (%) = (70 mL / 120 mL) × 100
EF (%) = 0.583 × 100 = 58.3%
So, the Ejection Fraction Percentage for this patient is 58.3%. This falls within the normal range (typically 50-70%), indicating that the heart is pumping blood efficiently.
Most Common FAQs
A normal Ejection Fraction percentage generally ranges from 50% to 70%. This means that the left ventricle is pumping out 50-70% of the blood it holds with each heartbeat. Values below 50% may indicate heart dysfunction or damage.
A low Ejection Fraction (below 40%) can be a sign of heart failure or cardiomyopathy, which may indicate that the heart is not pumping blood efficiently. A low EF% can help doctors assess the severity of heart disease and determine appropriate treatment options.
In some cases, a low Ejection Fraction can improve with treatment, such as medication, lifestyle changes, or medical procedures like heart surgery or implantable devices. However, recovery depends on the underlying cause of the low EF% and the patient’s overall health condition.