Prosthetic Mitral Valve Effective Orifice Area (EOA)

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Data Acquisition

Prosthetic mitral valve EOA

Reference Values

Prosthetic MV Stenosis
EOA (cm2) DVI
Normal ≥2.0 <2.2
Possible stenosis 1-2 2.2-2.5
Suggest significant stenosis <1.0 >2.5

Formulas

\[EOA = \frac{\pi (LVOT/2)^2 \times VTI_{LVOT}}{VTI_{PrMV}} \]

\[DVI = \frac{VTI_{PrMV}}{VTI_{LVOT}}\]

Definitions

VTILVOT Velocity-time integral at LVOT
LVOT Left ventricular outflow tract diameter
VTIPrMV Velocity-time integral across prosthetic mitral valve
EOA Effective Orifice Area
DVI Doppler Velocity Index
MV Mitral valve

Reference

1. Zoghbi WA, et al. Recommendations for evaluation of prosthetic valves with echocardiography and Doppler ultrasound. J Am Soc Echocardiogr 2009; 22(9):994-995. Full text

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Developer & Illustrator: Sirikarn Napan, MD, FACC