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PVR = ( TR Vmax : RVOT TVI ) x 10 + 0,16

TR Vmax: CW, Apical 4C view.
RVOT TVI: PW, PS SAX.

PVR - index of pulmonary vascular resistance.
TR Vmax - peak tricuspid regurgitant velocity.
RVOT TVI -  RVOT time-velocity integral.


Example:
TR Vmax = 2,78 m/s
RVOT TVI = 11 cm
PVR = ( 2,78 : 11 ) x 10 + 0,16 = 0,25 x 10 + 0,16 = 2,68