Algorithm for the diagnosis and treatment of pulmonary hypertension in infants with bronchopulmonary dysplasia based on recommendations from PPHNet. PPHNet, pediatric pulmonary hypertension network; BPD, bronchopulmonary dysplasia; PH, pulmonary hypertension; ECHO, echocardiogram; PAP, pulmonary arterial pressure; SAP, systemic arterial pressure; BNP, brain-type natriuretic peptide; NT-proBNP, N-terminal proBNP; PVS, pulmonary vein stenosis; LVDD, left ventricular diastolic dysfunction; APC, aortopulmonary collateral. Modified, with permission, from Krishnan U, et al., 2017 (320).