Canonical: https://echosuite.app/guides/mitral-pht/

# Mitral valve area calculator: pressure half-time

Find the pressure half-time method for mitral valve area, with measurement acquisition guidance and source context.

Created by [Mohammed Kamareddine, MD](https://echosuite.app/about/) · [Sources & educational scope](https://echosuite.app/about/)

[Open interactive calculator →](https://echosuite.app/calculators/#mitral-pht)

## 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

[Primary reference](https://www.asecho.org/wp-content/uploads/2025/04/PIIS0894731722005211.pdf)

- 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.

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