EpistemisMitral Valve Area by Hemipressure Time (Hatle) and Mean Gradient
Hemipressure time measures how long it takes for the transmitral gradient to fall by half: the narrower the valve, the slower the descent. The empirical constant of 220 converts that time into area.
Required inputs
| Variable | Example value |
|---|---|
| Pressure half time (PHT) (ms) | 150 |
| Mean transmitral gradient (mmHg) | 6 |
| Pulmonary artery systolic pressure (mmHg) | 35 |
Run the calculation in the app
This page explains the score but does not run it. In Epistemis, the calculator validates units, flags values outside physiological ranges, and provides the interpretation that a number alone cannot convey.
Epistemis is educational review material. It is not a medical device, does not diagnose or prescribe treatment, and does not replace formal medical training, current clinical guidelines, or professional clinical judgment.
- Specialty
- Cardiology
- Area
- Internal Medicine
- Variables
- 3