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SPAP = 4 x (Vmax TR)² + estimated RAP

Vmax TR: CW, Apical 4C view.

RAP: inferior vena cava view.

SPAP - Systolic Pulmonary Artery Pressure.
 
Example:

Vmax TR = 2,8 m/s

RAP = 3 mmHg

SPAP = 4 x (2,8)² + 10 = 31 + 3 = 34 mmHg