Mitral Valve Area Calculator

Mitral Valve Area Calculator. Enter your echocardiographic measurements to estimate Mitral Valve Area (MVA) using three established methods: Pressure Half-Time (PHT), Deceleration Time (DT), and the Continuity Equation. Input values like PHT, deceleration time, LVOT diameter, LVOT VTI, and Mitral Valve VTI to get your MVA results in cm² along with stenosis severity classification. Also try the RCRI Calculator.

Select the echocardiographic method used to measure MVA.

ms

Time for the peak pressure gradient to fall to half its initial value (ms).

ms

E-wave deceleration time measured on Doppler echocardiography (ms).

cm

Left Ventricular Outflow Tract diameter measured by 2D echo (cm).

cm

Velocity Time Integral of the LVOT measured by pulsed-wave Doppler (cm).

cm

Velocity Time Integral across the mitral valve measured by continuous-wave Doppler (cm).

Results

Mitral Valve Area (MVA)

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Stenosis Severity

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Method Used

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Results Table

How do I calculate mitral valve area using the Pressure Half-Time method?

The Pressure Half-Time (PHT) method uses the formula MVA = 220 / PHT, where PHT is measured in milliseconds. PHT is the time it takes for the peak transmitral pressure gradient to fall to half its original value. This is one of the most widely used echocardiographic methods for estimating MVA. See also our Duke Treadmill Score Calculator.

What is the difference between the PHT method and the Deceleration Time method?

Both methods rely on Doppler echocardiography of the mitral valve. The PHT method uses MVA = 220 / PHT, while the Deceleration Time method uses MVA = 759 / DT. The deceleration time (DT) is approximately 2× the PHT, so the two formulas yield similar results. PHT is more commonly cited in clinical guidelines.

How does the Continuity Equation calculate mitral valve area?

The continuity equation is based on conservation of flow: MVA = (π × (LVOT diameter / 2)² × LVOT VTI) / Mitral Valve VTI. It calculates the cross-sectional area of the LVOT, multiplies by the LVOT stroke volume (VTI), and divides by the mitral valve VTI. This method is most accurate when there is no significant aortic regurgitation or mitral regurgitation.

What is the normal mitral valve area?

A normal mitral valve area is approximately 4.0–6.0 cm². Values above 1.5 cm² typically indicate mild stenosis, 1.0–1.5 cm² indicates moderate stenosis, and below 1.0 cm² indicates severe mitral stenosis according to ACC/AHA guidelines.

What mitral valve area indicates severe stenosis?

According to ACC/AHA guidelines, an MVA below 1.0 cm² is classified as severe mitral stenosis. This is typically associated with a Pressure Half-Time greater than 220 ms and may require intervention such as percutaneous mitral balloon commissurotomy or surgical valve replacement.

Are the mitral valve and bicuspid valve the same thing?

Yes — the mitral valve is also called the bicuspid valve because it has two leaflets (cusps): the anterior and posterior leaflets. The term 'bicuspid' simply describes the two-leaflet anatomy. It should not be confused with a bicuspid aortic valve, which is a separate congenital condition affecting the aortic valve.

When should the Continuity Equation be avoided for MVA calculation?

The continuity equation is less accurate when significant aortic regurgitation (AR) or mitral regurgitation (MR) is present, as these conditions alter the VTI measurements used in the formula. In such cases, the PHT or deceleration time methods may provide more reliable estimates.

What is the mitral valve area of a patient with a deceleration time of 1000 ms?

Using the deceleration time formula (MVA = 759 / DT), a DT of 1000 ms yields an MVA of approximately 0.76 cm². This falls in the severe mitral stenosis range (MVA < 1.0 cm²) and warrants urgent clinical evaluation and likely intervention. You might also find our calculate Cerebral Perfusion Pressure useful.