Table 3. Echocardiographic probability of PH in symptomatic patients with a suspicion of PH.

Peak tricuspid regurgitation velocity m/s	Presence of other echocardiographic signs of PHa	Echocardiographic probability of PH
≤2.8 or not measurable	No	Low
≤2.8 or not measurable	Yes	Intermediate
2.9–3.4	No
2.9–3.4	Yes	High
>3.4	Not required

^a, right ventricle/left ventricle basal diameter ratio >1.0, flattening of the interventricular septum (left ventricular eccentricity index >1.1 in systole and/or diastole), right ventricular outflow doppler acceleration time <105 ms and/or mid-systolic notching, early diastolic pulmonary regurgitation velocity <2.2 m/s, pulmonary artery diameter >25 mm, inferior cava diameter >21 mm with decreased inspiratory collapse (<50% with a sniff of <20% with quiet inspiration), right atrial area (end-systole) >18 cm². Reproduced from (11) with permission. PH, pulmonary hypertension.