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Aortic Valve Area (Continuity Equation using VTI)

Calculation


VTI1 cm Height
VTI2 cm Weight
LVOT mm


AVA cm2
AVA Index cm2/m2
Calculate

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Information

Definition of Aortic Stenosis Severity

AVA (cm2) AVAI (cm2/m2)
Normal 3.0-4.0
Mild >1.5 >0.85
Moderate 1.0-1.5 0.60-0.85
Severe <1.0 <0.6

Aortic Valve Area (VTI)

Aortic valve area can be calculated by using the principle of conservation of mass — "What comes in must go out".

Aortic valve area indexed to body surface area should be considered for the large and small extremes of body surface area.

For patients with prosthetic aortic valves, patient-prosthesis mismatch is suspected when effective orifice area (EOA) indexed to body surface area <0.85 to 0.9 cm2/m2. Patient-prosthesis mismatch is considered severe when EOA index <0.65.

EOA Index (cm2/m2)
Moderate <0.85
Severe <0.65

AVA =
π*(LVOT/2)2*VTI1
VTI2

Variable Definition
VTI1 Subvalvular velocity time integral (cm)
VTI2 Maximum velocity time integral across the valve (cm)
LVOT Left ventricular outflow tract diameter (cm)
Weight Weight (kg or lb)
Height Height (cm or in)
AVA Aortic Valve Area (cm2)
AVA Index Aortic Valve Area indexed to BSA (cm2/m2)

References


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