EROA
Pronunciation: ee-ROH-ah
Also written as: EROA — Effective Regurgitant Orifice Area
Quantitative measurement of the effective area of a regurgitant valve orifice, typically measured in square centimeters.
Full Definition
EROA (Effective Regurgitant Orifice Area) is a quantitative echocardiographic parameter that measures the effective cross-sectional area of a regurgitant valve orifice, expressed in square centimeters. EROA is calculated using the PISA method or quantitative Doppler techniques and represents the functional severity of valve regurgitation independent of hemodynamic conditions. For mitral regurgitation, EROA values >0.4 cm² indicate severe regurgitation, while values <0.2 cm² suggest mild regurgitation. EROA provides more accurate assessment than qualitative color Doppler alone and is essential for surgical decision-making. The measurement requires integration with other parameters including regurgitant volume and vena contracta width.
Usage
Usage note: Always express in square centimeters (cm²); critical threshold values vary by valve type.
In Context
- "The EROA measured 0.45 cm², confirming severe mitral regurgitation requiring surgical intervention." — Quantitative echo report
- "Calculate EROA using the formula: regurgitant volume divided by regurgitant VTI." — Technical guideline