Table 1.

Echocardiographic parameters used to assess the echocardiographic probability of pulmonary hypertension

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 vena cava diameter > 21 mm with decreased inspiratory collapse (< 50% with a sniff or < 20% with quiet respiration)
Flattening of the interventricular septum (left ventricular eccentricity index > 1.1 in systole or both systole and diastole)	Early diastolic pulmonary regurgitation velocity > 2.2 m/s	Right atrial area (end systole) > 18 cm2
	Pulmonary artery diameter > 25 mm

Adapted from British Society of Echocardiography guidelines on the assessment of suspected pulmonary hypertension [4]. *Echocardiographic parameters from at least two different categories (A/B/C) from the list should be present to alter the level of echocardiographic probability of pulmonary hypertension