1. What is Ejection Fraction?

Ejection Fraction (EF) is a measurement of the percentage of blood leaving the heart each time it contracts. It is a key indicator of heart function and is used to diagnose and monitor various heart conditions.

2. How Does the Calculator Work?

The calculator uses the ejection fraction formula:

Where:

• \( SV \) — Stroke Volume (mL)
• \( EDV \) — End-Diastolic Volume (mL)
• \( EF \) — Ejection Fraction (%)

Explanation: The equation calculates the percentage of blood pumped out of the left ventricle with each heartbeat.

3. Importance of EF Calculation

Details: EF measurement is crucial for assessing heart function, diagnosing heart failure, determining treatment strategies, and monitoring response to cardiac therapies.

4. Using the Calculator

Tips: Enter stroke volume and end-diastolic volume in mL. Both values must be valid positive numbers, and EDV should be greater than or equal to SV.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal ejection fraction range?
A: A normal ejection fraction is typically between 55% and 70%. Values below 40% may indicate heart failure.

Q2: What's the difference between SV and EDV?
A: EDV is the volume of blood in the ventricle at the end of diastole (filling phase), while SV is the volume of blood pumped out during systole (contraction phase).

Q3: How is EF measured clinically?
A: EF is commonly measured using echocardiography, cardiac MRI, or nuclear medicine tests.

Q4: Can EF values change over time?
A: Yes, EF can improve with appropriate treatment for heart conditions or worsen with disease progression.

Q5: What does a low EF indicate?
A: A low EF typically indicates reduced heart pumping ability and may suggest heart failure or other cardiac conditions.