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Mitral Valve Area by Pressure Half-Time (PHT)
Calcs>Mitral Stenosis>MVA by PHT>1
PHT msec
Mital Valve Area cm2

How to get an MVA by PHT.
Step 1: Obtain a PWD or a CWD of the mitral valve. The flow profile of the mitral valve will have a Vmax, typically the maximum velocity of the E wave. The time from the Vmax to the velocity equal to Vmax divided by 1.4 is the pressure half time. (Vmax / 1.4 is equivalent to the half pressure). 220 divided by the PHT is the mitral valve area.

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