Table 1 Definitions of terms used in this article

Pulmonary hypertension (PH)

Mean pulmonary artery pressure (mPAP) >25 mmHg

Moderate PH - mPAP between 30 and 45 mmHg

Severe PH - mPAP > 45 mmHg [6],[7]

Pulmonary vascular resistance (PVR)

mPAP-PAOP/cardiac output

Pulmonary vascular resistance index

mPAP-PAOP/cardiac index

Pulmonary vascular dysfunction (PVD)

Abnormal elevations in PVR identified by measurement of either transpulmonary gradient (mPAP-PAOP) and/or pulmonary vascular resistance index (mPAP-PAOP/cardiac index) [5]

Right ventricular dysfunction (RVD)

Pulmonary artery catheter-based definitions:

(i) RVD = CVP > PAOP and MPAP > 25 mmHg and SVI < 30 ml m⁻², or

(ii) RAP > PAOP

Acute cor pulmonale (defined by echo)

Ratio of RV to LV end-diastolic area >0.6 with interventricular septal flattening at end-systole