Mitral valve area calculator: pressure half-time
Find the pressure half-time method for mitral valve area, with measurement acquisition guidance and source context.
Method
MVA = 220 ÷ PHT
Use the measurement units shown below. Some fields apply only to a selected method or condition; follow the interactive tool’s method choices. The interactive tool keeps missing measurements incomplete and provides its method-specific results and reference context.
Measurements and acquisition
Mitral pressure half-time ms
CW Doppler deceleration slope
- Record a complete inflow or regurgitant CW envelope.
- Trace the deceleration slope using the machine PHT tool.
- Average representative beats and use additional beats in atrial fibrillation.
Sources and method context
American Society of Echocardiography · 2023 · Recommendations for the Use of Echocardiography in the Evaluation of Rheumatic Heart Disease · MS multiparametric approach pp. 5–7 · Table 1 and PHT method p. 6 · Figure 3 p. 7
- Equation & acquisition · PHT method and Figure 8 · PDF pp. 6–8
MVA = 220/PHT, good-quality transmitral Doppler requirements, linear versus bimodal deceleration-slope tracing, and rhythm averaging.
- Current severity ranges · Table 1 · PDF p. 6
MVA, PHT, mean gradient at heart rate 60–80 bpm, and systolic PA-pressure ranges for progressive and severe rheumatic MS.
- Limitations & integration · MS hemodynamic discussion · PDF pp. 5–7
Effects of compliance, LV diastolic pressure, AR, MR, LA fibrosis, subvalvular disease and recent PBMV, plus the requirement for multiparametric grading.
Catalogue review status: Exact guideline locator mapped · clinical sign-off pending
These pages describe the educational tool. Interpret measurements with the complete clinical context and the method’s acquisition limitations.