Mitral Valve Area Calculator
Calculate mitral valve area using multiple echocardiographic methods for stenosis assessment
Calculate Mitral Valve Area
Left ventricular outflow tract diameter
LVOT velocity time integral
Mitral valve velocity time integral
Results
⚠️ Important Clinical Considerations
Continuity Equation: Do NOT use with aortic or mitral regurgitation
Pressure Half-Time: Avoid with aortic stenosis, aortic regurgitation, diastolic dysfunction, or post-valvuloplasty
Deceleration Time: Related to PHT by: PHT = 0.29 × DT
Clinical Context: Always correlate with symptoms, physical examination, and other echo parameters
Example Calculation
Continuity Equation Example
LVOT Diameter: 2.1 cm
LVOT VTI: 21.2 cm
Mitral VTI: 74 cm
LVOT Area: π × (1.05)² = 3.5 cm²
MVA: (3.5 × 21.2) ÷ 74 = 1.0 cm²
Assessment: Moderate mitral stenosis
Pressure Half-Time Example
Pressure Half-Time: 220 ms
MVA: 220 ÷ 220 = 1.0 cm²
Assessment: Severe mitral stenosis (borderline)
Mitral Stenosis Severity
Method Selection Guide
Continuity Equation
Best when good LVOT images available
Pressure Half-Time
Most commonly used, simple measurement
Deceleration Time
Alternative to PHT, related measurement
⚕️ Medical Disclaimer
This calculator is for educational purposes only and should not replace professional medical assessment.
Always correlate results with clinical findings, symptoms, and other diagnostic tests.
Consult with a cardiologist for comprehensive evaluation and treatment decisions.
Understanding Mitral Valve Area Calculation
What is Mitral Valve Area?
Mitral valve area (MVA) is the effective opening area of the mitral valve, measured in cm². It's crucial for assessing mitral stenosis severity and determining treatment strategies.
Clinical Significance
- •Determines severity of mitral stenosis
- •Guides timing of intervention
- •Monitors disease progression
- •Correlates with symptoms and outcomes
Calculation Methods
1. Continuity Equation
MVA = (LVOT Area × LVOT VTI) ÷ Mitral VTI
Based on conservation of flow. Most accurate when LVOT can be measured reliably.
2. Pressure Half-Time
MVA = 220 ÷ PHT (ms)
Most commonly used method. PHT is time for pressure gradient to fall by half.
3. Deceleration Time
MVA = 759 ÷ DT (ms)
Alternative method. Related to PHT by: PHT = 0.29 × DT
Important Limitations
Continuity Equation:
- • Avoid with aortic regurgitation
- • Avoid with mitral regurgitation
- • Requires accurate LVOT measurement
Pressure Half-Time:
- • Avoid with aortic stenosis
- • Avoid with diastolic dysfunction
- • Inaccurate post-valvuloplasty