Aortic Valve Dimensionless Index / Velocity Ratio

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Data Acquisition

Aortic valve dimensionless index

Reference Values

Aortic Stenosis Severity Dimensionless Index
Normal 1.0
Mild >0.5
Moderate 0.25-0.50
Severe <0.25

Formulas

\[DI = \frac{V_{LVOT}}{V_{AV}}\]

\[DI = \frac{VTI_{LVOT}}{VTI_{AV}}\]

Definitions

V Velocity
VTI Velocity-time integral
LVOT Left ventricular outflow tract diameter
AV Aortic valve

Reference

1. Baumgartner H, et al. Echocardiographic assessment of valve stenosis: EAE/ASE recommendations for clinical practice. J Am Soc Echocardiogr. 2009 Jan;22(1):8,10. Full text

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Developer & Illustrator: Sirikarn Napan, MD, FACC