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Diagnostic approach to PH in premature neonates. pPROM: preterm prolonged rupture of membranes; Echo: echocardiography; BNP: B-type natriuretic peptide; PMA: post menstrual age; GERD: gastro-esophageal reflux disease; ASD: atrial septal defect; PDA: patent ductus arteriosus; SPC: systemic to pulmonary collaterals; PVS: pulmonary vein stenosis; RV: right ventricle; LV: left ventricle; CMR: cardiac magnetic resonance imaging; PVT: pulmonary vasodilator therapy.
