PAPi is ratio of pulmonary artery pulse pressure to right atrial pressure


PAPi is ratio of pulmonary artery pulse pressure (pulmonary artery systolic - pulmonary artery diastolic) to right atrial pressure.1

Right atrial pressure is measure of congestion. PA pulse pressure is measurement of RV stroke volume and afterload.

PAPi=PASPPADPRAPPAPi = \frac{PASP-PADP}{RAP}

Low PAPi is predictor of mortality in right sided heart failure.

Footnotes

  1. https://www.ahajournals.org/doi/10.1161/CIRCHEARTFAILURE.121.009085