A′	Myocardial late-diastolic velocity
ASD	Atrial septal defect
ASE	American Society of Echocardiography
AVV	Atrioventricular valve(s)
BT	Blalock–Taussig
CHD	Congenital heart disease
CT	Computed tomography
CW	Continuous wave
D	Diastolic
dPAP	End-diastolic PAP
E’	Myocardial early diastolic velocity
EF	Ejection fraction
EPPVDN	European Pediatric Pulmonary Vascular Disease Network
FAC	Fractional area change
HLHS	Hypoplastic left heart syndrome
HPAH	Hereditary PAH
IPAH	Idiopathic PAH
IVC	Inferior vena cava
IVRT	Isovolumic relaxation time
IVS	Intraventricular septum
LA	Left atrium/left atrial
LV	Left ventricle
LVEDP	LV end-diastolic pressure
LVesEI	End-systolic LV eccentricity index
LVOT	LV outflow tract
LVpsEIM	Post-systolic maximal eccentricity index
MAPCAs	Major aortopulmonary collateral arteries
mPAP	Mean PAP
MRI	Magnetic resonance imaging
NYHA FC	New York Heart Association functional class
PA	Pulmonary artery
PAAT	PA acceleration time
PAH	Pulmonary arterial hypertension
PAH-CHD	PAH associated with CHD
PAP	Pulmonary artery pressure
SPAP	Systolic PAP
PAWP	PA wedge pressure
PDA	Persistent ductus arteriosus
PH	Pulmonary hypertension
PR	Pulmonary regurgitation
PSAX	Parasternal short axis
PVD	Pulmonary vascular disease
PVR(i)	Pulmonary vascular resistance (indexed)
PW	Pulsed waved
RA	Right atrium/right atrial
RAP	Right atrial pressure
RVEDP	RV end-diastolic pressure
RVEF	RV ejection fraction
RVET	RV ejection time
RVOT	Right ventricular outflow tract
RVSP	Right ventricular systolic pressure
S	Systolic
S-TAPSE	Subcostal TAPSE
S’	Myocardial systolic velocity
SBP	Systolic blood pressure
TAPSE	Tricuspid annular peak systolic excursion
TDI	Tissue Doppler imaging
TOF	Tetralogy of Fallot
TPG	Transpulmonary gradient
TR(V)	Tricuspid regurgitation (velocity)
TTE	Transthoracic echocardiography
VEDP	Ventricular end-diastolic pressure
VO2 peak	Peak oxygen uptake
VSD	Ventricular septal defects
VTI	Velocity–time integral
VVI	Ventricular–ventricular interactions
WSPH	World Symposium on Pulmonary Hypertension