Aortic valve area (continuity) + dimensionless index

AVA (VTI) = (LVOT area × LVOT VTI) / AV VTI. DI = LVOT VTI / AV VTI (or LVOT Vmax / AV Vmax).

Inputs

LVOT diameter

LVOT VTI

AV VTI

Optional: velocity ratio using Vmax

LVOT Vmax

m/s

AV Vmax

m/s

DI is handy when LVOT diameter measurement is uncertain (DI cancels LVOT area).

LVOT area

Area = π × (d/2)²

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Aortic valve area (AVA)

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Dimensionless index (VTI)

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Dimensionless index (Vmax)

If Vmax values provided

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Note: Severity grading also uses Vmax and mean gradient. Use your lab’s guideline set for final grading.