1. What is Ejection Fraction?

Ejection Fraction (EF) is a measurement of how much blood the left ventricle pumps out with each contraction. It's expressed as a percentage and is an important indicator of heart function.

2. How Does the Calculator Work?

The calculator uses the Ejection Fraction formula:

Where:

• \( EDV \) — End-diastolic volume (ml)
• \( ESV \) — End-systolic volume (ml)

Explanation: The equation calculates the percentage of blood ejected from the ventricle during systole compared to the total ventricular volume.

3. Importance of EF Calculation

Details: EF is crucial for assessing heart function, diagnosing heart failure, and determining the severity of cardiac conditions. It helps guide treatment decisions.

4. Using the Calculator

Tips: Enter EDV and ESV in milliliters (ml). EDV must be greater than ESV, and both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal ejection fraction?
A: A normal EF is typically between 50-70%. Below 40% may indicate heart failure with reduced ejection fraction (HFrEF).

Q2: How is EDV and ESV measured?
A: These are typically measured using echocardiography, cardiac MRI, or other cardiac imaging techniques.

Q3: What does a low EF indicate?
A: A low EF may indicate heart failure, cardiomyopathy, or other conditions affecting heart function.

Q4: Can EF be greater than 100%?
A: No, EF cannot exceed 100% as it represents the percentage of blood ejected from a full ventricle.

Q5: What is preserved EF heart failure?
A: Heart failure with preserved EF (HFpEF) occurs when EF is normal (≥50%) but the heart doesn't fill properly.