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EROA – Mitral Regurgitation Calculator
Calculate Effective Regurgitant Orifice Area (EROA) via PISA method
PISA Formula: $\text{EROA} = \frac{2 \times \pi \times \text{Radius}^2 \times \text{Nyquist Velocity}}{\text{Peak Regurgitant Velocity}}$. Severe mitral regurgitation is typically defined as EROA $\ge 0.40 \text{ cm}^2$ (or $\ge 0.20 \text{ cm}^2$ for primary MR). Enter echo measurements below.
Echocardiography Parameters Input
Calculation Results
⚠️ Not medical advice. For echocardiography and cardiology reference only. Valvular heart disease grading and clinical interventions must be evaluated by a qualified cardiologist or echocardiographer.