| Variables |
|---|
| Systolic pulmonary artery pressure (sPAP) |
| sPAP = 4(TRVmax)2 + RAP |
| Mean pulmonary artery pressure (mPAP) |
| mPAP = 4(Early PI velocity)2 + RAP |
| mPAP = 1/3 sPAP + 2/3 dPAP |
| mPAP = 79 - 0.45 × Acceleration Time |
| Abnormal: ≥25 mmHg |
| Diastolic pulmonary artery pressure (dPAP) |
| dPAP = 4(End PI velocity)2 + RAP |
RAP, Right atrial pressure.