1. What is the Biplane Simpson Method?

The Biplane Simpson method (also called the "method of disks") is a technique for calculating left ventricular ejection fraction (EF) using two-dimensional echocardiography. It's more accurate than visual estimation and is considered the standard for EF measurement.

2. How Does the Calculator Work?

The calculator uses the Biplane Simpson formula:

Where:

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

Explanation: The method calculates volumes by summing the areas of multiple disks along the long axis of the ventricle in both apical 4-chamber and 2-chamber views.

3. Importance of EF Calculation

Details: Ejection fraction is a key measure of cardiac function. It helps diagnose and classify heart failure, guide treatment decisions, and assess prognosis.

4. Using the Calculator

Tips: Enter EDV and ESV in milliliters (ml) as measured by echocardiography. EDV must be greater than ESV for valid results.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal ejection fraction?
A: Normal EF is typically 55-70%. Below 40% indicates reduced EF (systolic dysfunction).

Q2: How does this differ from visual EF estimation?
A: The Simpson method is quantitative and more reproducible than visual estimation, especially in patients with regional wall motion abnormalities.

Q3: When is the Biplane Simpson method preferred?
A: It's preferred when accurate EF measurement is crucial, such as for chemotherapy monitoring or surgical planning.

Q4: What are limitations of this method?
A: It requires good image quality and is less accurate if endocardial borders aren't clearly visualized.

Q5: Can this be used with other imaging modalities?
A: While primarily for echocardiography, the same principle applies to cardiac MRI and CT volume measurements.