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Aortic Valve Area by Doppler Continuity

Calculate Doppler continuity valve area from LVOT diameter and velocity-time integrals.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Health results are educational estimates, not a diagnosis or treatment recommendation. A qualified clinician can interpret measurements in the context of your health.

Formula and method

LVOT diameter 20 mm (2 cm), LVOT VTI 20 cm and aortic VTI 40 cm give 1.5708 cm².

Valve area = 0.7854 × LVOT diameter² × LVOT VTI / aortic-jet VTI, using matching length units.

Worked example

Enter these known values and leave the other values blank.

LVOT diameter
20 mm
LVOT velocity-time integral
20 cm
Aortic jet velocity-time integral
40 cm
Aortic valve area
1.57 cm²

Assumptions and limitations

  • The captured 0.7854 coefficient is a rounded π/4 circular-area approximation. Accurate LVOT diameter and Doppler acquisition are essential. Valve area alone does not establish stenosis severity; guideline grading integrates velocity, gradient, flow, symptoms and other findings.
  • Clear the unknown field before solving the supported arithmetic inverse.
  • This clinical measurement model does not determine treatment.

Common questions

How is this model calculated?

Valve area = 0.7854 × LVOT diameter² × LVOT VTI / aortic-jet VTI, using matching length units.

How should I interpret the result?

The captured 0.7854 coefficient is a rounded π/4 circular-area approximation. Accurate LVOT diameter and Doppler acquisition are essential. Valve area alone does not establish stenosis severity; guideline grading integrates velocity, gradient, flow, symptoms and other findings.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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