A pulmonary regurgitation (PR) signal is obtained in the parasternal short axis view using colour Doppler. CW Doppler at a sweep speed of 100 mm/s is used to measure the peak PR velocity (Fig. 3). Peak pressure difference (measured by the Bernoulli equation) is then added to the RAP. This method has been validated against gold standard catheter-measurements , .
Mean PAP can be approximated from the peak PR Doppler signal using the following formula: mPAP = 4(PRpeak velocity)2 + RAP.
mPAP = 2/3rd of PADP + 1/3rd of PASP.