AS: Aortic Valve Area (DVI)

Estimate aortic valve area


Derivation of valve area is based the continuity equation which states that the flow passing through the LVOT has to equal the flow through the AV. The Doppler Velocity Index (DVI) is useful for assessing aortic prosthetic valve function as well as screening for valve obstruction. It is calculated as the ratio of the subvalvular velocity obtained by PW Doppler and the maximum velocity obtained by CW Doppler across the prosthetic valve. This peak velocity ratio is dimensionless and does not rely on determination of cross-sectional area of the LVO thus making it less dependent on valve size and especially useful when the valve size is not known.

A ratio <0.23 indicates significant prosthetic stenosis


Oh J, Seward JB, Tajik AJ.

The Echo Manual 3rd edition. Lippincott, Williams, Wilkins. 2007

The AS: Aortic Valve Area (DVI) calculator is created by QxMD.

Created by on 14/03/2016

By using this site you acknowledge that you have read, understand, and agree to be bound by our terms of use and privacy policy. All content and tools are for educational use only, are not meant to be a substitute for professional advice and should not be used for medical diagnosis and/or medical treatment.

1. Subvalvular Velocity (LVOT)?

0/2 completed