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Aortic Valve Area Calculator
See below for instructions and an example
Sample Calculation
To get the aortic valve area you need the views below
Description and Example:
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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.
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By the continuity Equation:
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Area1xVTI1 = Area2x VTI2
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LVOT Area x LVOT VTI = AV Area x AV VTI
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3.14(2.0cm/2)^2 x 24cm = AV Area x 124cm
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AV Area = 0.6cm^2, which is consistent with severe aortic stenosis.
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