Mitral Valve Area by Pressure Half-Time
Mitral valve area by pressure half-time (Hatle 1979) = 220 / pressure half-time (ms); > 1.5 cm^2 mild, 1.0-1.5 moderate, < 1.0 severe mitral stenosis.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Pressure half-time
- 150 ms
Result: Mitral valve area 1.47 cm^2 — moderate mitral stenosis (1.0-1.5).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- > 1.5
- Mild or no significant mitral stenosis.
- 1.0-1.5
- Moderate mitral stenosis.
- < 1.0
- Severe mitral stenosis (220 / PHT). Unreliable post-valvotomy or with significant AR. A hemodynamic estimate, not a diagnosis.
What you enter
- Pressure half-time
How this is calculated
Hatle L, Angelsen B, Tromsdal A. Noninvasive assessment of atrioventricular pressure half-time by Doppler ultrasound. Circulation. 1979;60(5):1096-1104. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.