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Aortic Valve Area by Continuity Equation — result sheet
Estimate effective aortic valve area from LVOT diameter, LVOT velocity-time integral, and aortic valve velocity-time integral.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: LVOT area = π(diameter ÷ 2)²; stroke volume = LVOT area × LVOT VTI; effective AVA = stroke volume ÷ aortic valve VTI.
The continuity equation treats forward flow through the LVOT and the aortic valve as the same stroke volume, then solves for an effective valve area. The page also reports the LVOT area, stroke volume estimate, and dimensionless VTI ratio so each step can be inspected.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- LVOT diameter — cm; minimum 0.1; maximum 10
- LVOT velocity-time integral — cm; minimum 0.1; maximum 200
- Aortic valve velocity-time integral — cm; minimum 0.1; maximum 500
Worked example
| Input | Value |
|---|---|
| LVOT diameter | 2 |
| LVOT velocity-time integral | 20 |
| Aortic valve velocity-time integral | 80 |
LVOT area = 3.1416 cm², stroke volume = 62.832 mL, effective AVA = 0.7854 cm².
Assumptions and limits
- LVOT diameter and both VTIs are measured in compatible echocardiographic units.
- The LVOT is treated as circular for the area calculation.
- The entered VTI values represent the same cardiac cycle or appropriately averaged cycles.
- The worksheet does not validate Doppler alignment, tracing quality, rhythm, flow state, or valve regurgitation.
- Effective orifice area is not the same as a direct anatomic planimetered area.
- No severity or treatment decision is generated by the calculator.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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