1. What is LVEF?

Left Ventricular Ejection Fraction (LVEF) is a measurement of how much blood the left ventricle pumps out with each contraction. It's expressed as a percentage of the total blood volume in the ventricle at the end of diastole.

2. How Does the Calculator Work?

The calculator uses the LVEF equation:

Where:

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

Explanation: The equation calculates the percentage of blood ejected from the left ventricle during systole compared to the total volume present at the end of diastole.

3. Importance of LVEF Calculation

Details: LVEF is a key indicator of heart function. It helps diagnose and monitor heart failure, assess cardiac function after myocardial infarction, and guide treatment decisions.

4. Using the Calculator

Tips: Enter EDV and ESV in milliliters (mL). Both values must be positive numbers with EDV greater than ESV for a valid calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal LVEF range?
A: Normal LVEF is typically 55-70%. 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 nuclear medicine studies.

Q3: What causes reduced LVEF?
A: Common causes include coronary artery disease, myocardial infarction, cardiomyopathy, and valvular heart disease.

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

Q5: How often should LVEF be measured?
A: Frequency depends on the clinical situation, but typically every 3-12 months for patients with known heart failure.