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Use our free Mitral Valve Area Calculator to calculate MVA instantly with PHT, Continuity Equation, and Gorlin Formula. Fast, accurate, and easy to use.
| MVA (cm²) | Severity | Mean Gradient | PHT (approx.) | Clinical Features |
|---|---|---|---|---|
| 4 – 6 | Normal | < 3 mmHg | < 55 ms | Asymptomatic; normal exercise tolerance |
| > 1.5 | Mild MS | < 5 mmHg | 55–146 ms | Symptoms only with strenuous exertion; often well tolerated |
| 1.0 – 1.5 | Moderate MS | 5 – 10 mmHg | 147–220 ms | Symptoms on moderate exertion; dyspnoea, fatigue |
| < 1.0 | Severe MS | > 10 mmHg | > 220 ms | Symptoms at rest or minimal exertion; intervention often indicated |
| Method | Setting | Key Requirement | Limitation |
|---|---|---|---|
| PHT (220 ÷ PHT) | Echocardiography | CW Doppler E-wave deceleration slope | Unreliable post-valvuloplasty, with AR, or abnormal LV relaxation |
| Continuity Equation | Echocardiography | Accurate LVOT diameter + VTI | Inaccurate if significant AR or MR; sensitive to LVOT diameter error |
| Gorlin Formula | Cardiac Catheterization | Simultaneous PCWP, LV pressure, CO | Invasive; less accurate at low CO states |
A Mitral Valve Area Calculator helps you find the size of the mitral valve opening. Doctors often use this value to check for mitral stenosis. A narrow valve makes it harder for blood to flow from the left atrium to the left ventricle.
Doing the math by hand takes time. It can also lead to mistakes. Our Mitral Valve Area Calculator makes the process quick and simple. Just enter your values. The calculator does the rest in seconds.
It supports three common medical methods. These include the Pressure Half-Time (PHT) method, the Continuity Equation, and the Gorlin Formula. The tool also explains each step. That makes it useful for students, doctors, nurses, and researchers.
If you need a fast and reliable way to calculate Mitral Valve Area (MVA), this calculator is a great choice.
The mitral valve sits between the left atrium and the left ventricle. It opens to let blood pass. It then closes to stop blood from flowing backward.
The size of this opening is called the Mitral Valve Area (MVA), which can be affected by blood pressure, as measured by a Blood Pressure Calculator.
A healthy valve usually has an area between 4 and 6 cm². A smaller opening may mean the valve has become narrow. This condition is known as mitral stenosis.
Doctors use the MVA value to judge how severe the narrowing is. This helps them choose the best treatment.
There are three accepted ways to calculate Mitral Valve Area.
Mitral Valve Area = 220 ÷ Pressure Half-Time
Where:
Pressure Half-Time (PHT) is measured in milliseconds (ms).
Mitral Valve Area = (LVOT Area × LVOT VTI) ÷ Mitral Valve VTI
First calculate:
LVOT Area = π × (LVOT Diameter ÷ 2)²
Where:
Mitral Valve Area = Cardiac Output ÷ (Diastolic Filling Period × Heart Rate × 0.85 × 44.3 × √Mean Pressure Gradient)
Where:
Using the calculator is simple.
The calculator instantly shows:
Mitral Valve Area (cm²)
Severity of mitral stenosis
Step-by-step calculations
Clinical interpretation
You do not need to solve any equations yourself.
Pressure Half-Time = 176 ms
Formula:
Mitral Valve Area = 220 ÷ 176
Calculation:
Mitral Valve Area = 1.25 cm²
Result:
The valve area is 1.25 cm².
This falls into the moderate mitral stenosis range.
LVOT Diameter = 2.1 cm
LVOT VTI = 21.2 cm
Mitral Valve VTI = 74 cm
Step 1
LVOT Area = π × (2.1 ÷ 2)²
LVOT Area = 3.46 cm²
Step 2
Mitral Valve Area = (3.46 × 21.2) ÷ 74
Mitral Valve Area = 0.99 cm²
Result:
The valve area is 0.99 cm².
This suggests severe mitral stenosis.
Cardiac Output = 5000 mL/min
Heart Rate = 75 bpm
Diastolic Filling Period = 0.40 sec/beat
Mean Pressure Gradient = 10 mmHg
Step 1
√10 = 3.162
Step 2
Denominator
0.40 × 75 × 0.85 × 44.3 × 3.162
= 3568.4
Step 3
Mitral Valve Area
5000 ÷ 3568.4
= 1.40 cm²
Result:
The valve area is 1.40 cm².
This falls into the moderate mitral stenosis category.
The Mitral Valve Area tells doctors how well blood moves through the heart.
A normal valve allows blood to flow with little effort.
A narrow valve slows blood flow. That raises pressure inside the heart and lungs.
Knowing the valve area helps doctors decide if medicine is enough or if a procedure is needed.
It also helps track changes over time.
Normal: 4.0–6.0 cm²
Mild Mitral Stenosis: More than 1.5 cm²
Moderate Mitral Stenosis: 1.0–1.5 cm²
Severe Mitral Stenosis: Less than 1.0 cm²
These ranges help doctors understand the condition quickly.
Our Mitral Valve Area Calculator makes heart valve calculations easy. You only need to enter a few measurements. The calculator performs every step for you. It also explains the results in clear language.
Whether you are a medical student, healthcare professional, or researcher, this tool saves time and reduces calculation errors. It supports the three most trusted methods used in modern cardiology. That makes it a practical choice for learning, research, and clinical reference.
A normal Mitral Valve Area is usually between 4 and 6 cm².
A low value often means the mitral valve has become narrow. This condition is called mitral stenosis.
The Pressure Half-Time (PHT) method is the most common non-invasive method during echocardiography.
Doctors usually use the Gorlin Formula during cardiac catheterization. It is an invasive method.
No. The calculator is an educational and clinical support tool. A qualified healthcare professional should always interpret the results.
The final Mitral Valve Area is shown in square centimeters (cm²). Other inputs use standard medical units such as milliseconds, centimeters, beats per minute, seconds per beat, and millimeters of mercury.
Yes. You can use the calculator online at any time without paying.