Aortic Valve Area Calculator

See below for instructions and an example

Sample Calculation

To get the aortic valve area you need the views below

qpqs lvot dimater.jpg
LVOT VTI measure.jpg
AV VTI measure.jpg

Description and Example:

1) LVOT diameter from the PLAX view (in most people this is near 2 cm). This is assumed to be constant throughout systole.

 

2) LVOT velocity and/or VTI from the 5 chamber or apical long axis view.

 

3) The velocity of VTI at the aortic valve from the 5 chamber or apical long axis view.

By the continuity Equation:

Area1xVTI1 = Area2x VTI2 

LVOT Area x LVOT VTI = AV Area x AV VTI

3.14(2.0cm/2)^2 x 24cm = AV Area x 124cm 

AV Area = 0.6cm^2, which is consistent with severe aortic stenosis.

AS categories.png