How to get Tricuspid Valve Area by Pressure Half-Time
Obtain a PWD or a CWD of the tricuspid valve. The flow profile of the tricuspid 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). 190 divided by the PHT is the tricuspid valve area.