ERO Calculation ECHO Online

The ERO calculation echo is a fundamental tool used in cardiology to evaluate the severity of valvular regurgitation, specifically involving the mitral valve. It provides clinicians with essential data to determine the degree of blood flow back through the valve, enabling them to make informed decisions regarding patient treatment and management.

Formula of ERO Calculator ECHO

The EROA (Effective Regurgitant Orifice Area) is calculated using the following formula:

EROA = (MR flow rate) / (Aortic flow rate) × π × (radius of the narrowest part of the leak)^2

• MR flow rate: This represents the amount of blood that leaks back through the mitral valve.
• Aortic flow rate: This indicates the amount of blood flowing through the aortic valve.
• π (pi): A mathematical constant approximately equal to 3.14159.
• Radius of the narrowest part of the leak: This refers to the size of the narrowest section of the regurgitation jet, typically measured within the heart.

Expressing the EROA in square centimeters (cm²) provides valuable information about the regurgitant flow.

ERO Calculation Echo in Practice

To make ERO calculation echo more accessible, here’s a table of general terms and their definitions:

Term	Definition
Regurgitation	Backflow of blood through a heart valve.
Mitral Valve	A heart valve separating the left atrium and ventricle.
Aortic Valve	A heart valve separating the left ventricle and the aorta.
Echocardiography	A medical imaging technique using ultrasound to visualize the heart.

Example

Let’s walk through a simple example of how to calculate EROA:

Suppose you have the following values:

• MR flow rate: 50 ml/s
• Aortic flow rate: 100 ml/s
• Radius of the narrowest part of the leak: 2 mm (0.2 cm)

Using the formula, you can calculate EROA:

EROA = (50 ml/s) / (100 ml/s) × π × (0.2 cm)^2 ≈ 0.0314 cm²

So, in this example, the Effective Regurgitant Orifice Area (EROA) is approximately 0.0314 cm².

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