Calculate Effective Regurgitant Orifice Area for valvular assessment.
Echo Measurements
cm
cm/s
cm/s
Valvular Assessment
Calculated EROA0.32cm²
Moderate MR
Mitral Valve Grading
ASE Severity Criteria
Mild< 0.20 cm²
Moderate0.20 - 0.39 cm²
Severe≥ 0.40 cm²
About this calculator
Overview
The Effective Regurgitant Orifice Area (EROA) is a key echocardiographic parameter used to quantify the severity of mitral regurgitation (MR). It represents the actual size of the hole through which blood is leaking back into the left atrium.
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Pro Tips
Optimize the Nyquist limit (aliasing velocity) to get a clear hemispherical PISA radius (usually 20-40 cm/s).
Measurements are very sensitive to the radius (r) because it is squared in the formula.
Be careful with eccentric jets, as the hemispherical assumption may lead to underestimates.
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Fun Facts
"EROA ≥ 0.40 cm² is indicative of severe primary mitral regurgitation."
"The PISA method assumes a hemispherical shape of the flow convergence zone."
"Measurements should ideally be taken in the mid-systolic phase."
"The calculated Regurgitant Volume (RVol) can be derived as EROA × MR VTI."
