Aortic Valve Area Calculator

To calculate the aortic valve area, multiply the cross-sectional area of the LVOT by the VTI of the LVOT, and divide the result by the VTI of the aortic valve.

Aortic Valve Area Calculator

Enter any 3 values to calculate the missing variable

Aortic Valve Area

cm² mm² m² in² ft²

Cross-sectional Area of the Aortic Valve

cm² mm² m² in² ft²

Velocity Time Integral of the LVOT

cm mm m in ft

Velocity Time Integral of the Aortic Valve

cm mm m in ft

Calculate Reset

The Aortic Valve Area (AVA) Calculator helps assess the severity of aortic valve stenosis by measuring the valve area. The AVA is calculated using the continuity equation, which involves determining the cross-sectional area (CSA) of the left ventricular outflow tract (LVOT) and the velocity-time integrals (VTI) of both the LVOT and the aortic valve.

This calculator is crucial for diagnosing aortic stenosis, guiding treatment, and understanding overall heart function. Knowing the AVA can help physicians estimate the severity of valve narrowing and recommend necessary interventions.

Formula

AVA = (CSA × VTI LVOT) / VTI AV

Variable	Description
AVA	Aortic Valve Area (cm²)
CSA	Cross-Sectional Area of LVOT (cm²)
VTI LVOT	Velocity-Time Integral of Left Ventricular Outflow Tract
VTI AV	Velocity-Time Integral of the Aortic Valve

How to Calculate ?

1. Measure the cross-sectional area (CSA) of the left ventricular outflow tract (LVOT).
2. Obtain the velocity-time integrals (VTI) for both the LVOT and the aortic valve.
3. Multiply the CSA by the VTI LVOT.
4. Divide the result by the VTI AV to get the aortic valve area (AVA).

Solved Calculation :

Example 1

Step	Calculation
Given CSA	3.0 cm²
VTI LVOT	20 cm
VTI AV	40 cm
AVA Calculation	(3.0 cm² × 20 cm) ÷ 40 cm
Result	1.5 cm²

Answer: The aortic valve area is 1.5 cm².

Example 2

Step	Calculation
Given CSA	2.5 cm²
VTI LVOT	22 cm
VTI AV	44 cm
AVA Calculation	(2.5 cm² × 22 cm) ÷ 44 cm
Result	1.25 cm²

Answer: The aortic valve area is 1.25 cm².

What is Aortic Valve Area Calculator ?

The aortic valve area calculator helps assess the size of the aortic valve, which is crucial in diagnosing conditions like aortic stenosis.

Different methods are available for this calculation, such as using the continuity equation or the Gorlin formula. These methods take into account important factors like the aortic valve pressure gradient and Vmax (maximum velocity).

The normal aortic valve area typically ranges between 2.5 to 4.5 cm², but when the valve becomes narrowed (stenosis), this area decreases, often requiring intervention. For more precise measurements, the indexed aortic valve area calculator adjusts for a patient’s body size, and the projected aortic valve area calculator is used for assessing prosthetic valves.

Final Words:

Measurements are typically performed using aortic valve echo tests or during a catheterization. The Hakki equation is also commonly used for quick calculations when catheterization data is available. Understanding these methods helps in determining whether the aortic valve needs further treatment.