Table 1.

Definitions of terms used in this article

Terms	Definition
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