Calculated Ejection Fraction (EF) Calculator
Use this calculator to determine the Ejection Fraction (EF) based on End-Diastolic Volume (EDV) and End-Systolic Volume (ESV).
Calculated Ejection Fraction:
"; resultDiv.innerHTML += "Your Ejection Fraction (EF) is: " + ef.toFixed(2) + "%"; if (ef >= 55) { resultDiv.innerHTML += "This EF value is generally considered normal."; } else if (ef >= 40 && ef = 30 && ef < 40) { resultDiv.innerHTML += "This EF value suggests moderately reduced heart function."; } else { // ef < 30 resultDiv.innerHTML += "This EF value suggests severely reduced heart function."; } resultDiv.innerHTML += "Note: This is a simplified calculation. Consult a healthcare professional for medical advice."; }Understanding Ejection Fraction (EF)
Ejection Fraction (EF) is a vital measurement used in cardiology to assess the pumping efficiency of the heart. Specifically, it measures the percentage of blood that leaves the heart's main pumping chamber, the left ventricle, with each beat. A healthy heart pumps out more than half of the blood that fills the left ventricle.
What is End-Diastolic Volume (EDV) and End-Systolic Volume (ESV)?
- End-Diastolic Volume (EDV): This is the volume of blood in the left ventricle at the end of diastole (the relaxation phase, when the ventricle is maximally filled with blood, just before contraction). It represents the maximum amount of blood the ventricle holds.
- End-Systolic Volume (ESV): This is the volume of blood remaining in the left ventricle at the end of systole (the contraction phase, after the blood has been ejected). It represents the minimum amount of blood left in the ventricle after a beat.
The difference between EDV and ESV (EDV – ESV) is known as the Stroke Volume (SV), which is the amount of blood pumped out with each beat.
How is Ejection Fraction Calculated?
The formula for Ejection Fraction is:
EF (%) = ((EDV - ESV) / EDV) × 100
This formula essentially calculates the proportion of the total blood in the ventricle (EDV) that is ejected (Stroke Volume) and expresses it as a percentage.
Why is EF Important?
Ejection Fraction is a key indicator of heart health and is frequently used to diagnose and monitor conditions like heart failure. It helps doctors understand how well the heart is functioning as a pump.
Normal and Abnormal EF Ranges
- Normal EF (55% – 70%): A healthy heart typically has an EF in this range. It means the heart is pumping blood efficiently to meet the body's needs.
- Borderline EF (40% – 54%): This range may indicate mild heart damage or early stages of heart failure.
- Reduced EF (Less than 40%): An EF below 40% suggests heart failure. The lower the EF, the more severe the heart failure.
It's important to note that these ranges are general guidelines, and individual circumstances, symptoms, and other diagnostic findings are always considered by healthcare professionals.
How is EF Measured in Practice?
While this calculator uses EDV and ESV, these volumes are typically measured using medical imaging techniques, not directly by patients. Common methods include:
- Echocardiogram (Echo): A non-invasive ultrasound of the heart, the most common method.
- Cardiac MRI (Magnetic Resonance Imaging): Provides very detailed images of the heart.
- Cardiac CT (Computed Tomography): Another imaging technique that can measure heart volumes.
- Nuclear Stress Test: Uses radioactive tracers to assess heart function.
Disclaimer
This calculator provides a simplified estimation of Ejection Fraction based on user-provided volumes. It is intended for informational and educational purposes only and should not be used for self-diagnosis or as a substitute for professional medical advice. Always consult with a qualified healthcare provider for any health concerns or before making any decisions related to your health or treatment.
Example Calculation:
Let's say a patient's End-Diastolic Volume (EDV) is 130 mL and their End-Systolic Volume (ESV) is 60 mL.
Stroke Volume (SV) = EDV - ESV = 130 mL - 60 mL = 70 mL
EF = (SV / EDV) × 100 = (70 mL / 130 mL) × 100 ≈ 53.85%
In this example, the calculated Ejection Fraction is approximately 53.85%, which falls into the borderline or mildly reduced range.