Aortic Valve Area Calculator
See below for instructions and an example
To get the aortic valve area you need the views below
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.