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MPAP = 4 x (early PI velocity)² + estimated RAP

Early PI velocity : CW, PS SAX.
RAP: inferior vena cava view.

MPAP - Mean PA Pressure.

Example:
Early PI velocity = 3,05 m/s
RAP = 10 mmHg
MPAP = 4 x (3,05 )² + 10 = 37 + 10 = 47 mmHg