1. What is Ejection Fraction?

Ejection Fraction (EF) is a measurement of the percentage of blood leaving the heart each time it contracts. It's an important indicator of heart function and is used to diagnose and monitor heart failure.

2. How Does the Calculator Work?

The calculator uses the EF formula:

Where:

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

Explanation: The formula calculates what percentage of the total blood volume in the left ventricle is pumped out with each heartbeat.

3. Importance of EF Calculation

Details: EF is crucial for assessing heart function, diagnosing heart failure, determining prognosis, and guiding treatment decisions.

4. Using the Calculator

Tips: Enter EDV and ESV in milliliters (ml). EDV must be greater than ESV for a valid calculation.

5. Frequently Asked Questions (FAQ)

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

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

Q3: What's the difference between EF and cardiac output?
A: EF is a percentage, while cardiac output is the actual volume of blood pumped per minute (in liters).

Q4: Can EF be too high?
A: Yes, EF >75% may indicate hypertrophic cardiomyopathy or other conditions.

Q5: Does EF vary between individuals?
A: Yes, normal ranges account for individual variation, but values outside 50-70% typically warrant investigation.