Table 5. Chocardiographic signs suggesting pulmonary hypertension (PH), adapted from the original WSPH document (with prior permission).

(A) The ventricles	(B) Pulmonary artery	(C) Inferior vena cava and right atrium
Right ventricle/left ventricle basal diameter ratio >1.0	Right ventricular outflow Doppler acceleration time <105 ms and/or mid-systolic notching	Inferior cava diameter >21 mm with decreased inspiratory collapse (<50% with a sniff or <20% with quiet inspiration)
Flattening of the interventricular septum (left ventricular eccentricity index >1.1 in systole and/or diastole)	Early diastolic pulmonary regurgitation velocity >2.2 m·s–1	Right atrial area (end-systole) >18 cm2
	Pulmonary artery diameter >25 mm

Echocardiographic signs from at least two different categories (A/B/C) from the list should be present to alter the level of echocardiographic probability of PH.