PH	pulmonary hypertension
ILD	interstitial lung disease
PH-ILD	pulmonary hypertension associated interstitial lung disease
PVR	pulmonary vascular resistance
WU	Wood units
CPET	cardiopulmonary exercise testing
mPAP	mean pulmonary arterial pressure
eRVSP	estimated right ventricular systolic pressure
PCWP	pulmonary capillary wedge pressure
RV	right ventricular
6MWD	six-minute walk distance
RHC	right heart catheterization
WHO	World Health Organization
FC	functional class
WHO-FC	World Health Organization Functional Class
CT	computed tomography
PVRS	non-significant change in pulmonary vascular resistance during exercise
PVRD	increase in pulmonary vascular resistance during exercise
PFTs	Pulmonary function tests
FVC	forced vital capacity
DLCO	diffusing capacity for carbon monoxide
UIP	usual interstitial pneumonia
NSIP	nonspecific interstitial pneumonia
CPFE	combined pulmonary fibrosis and emphysema
PDE5	Phosphodiesterase-5