Growth differential factor‐15 (GDF‐15), asymmetric dimethylarginine (ADMA), endothelial‐1 (ET‐1), vascular endothelial growth factor (VEGF), and surfactant protein‐D (SP‐D) concentrations were found to change significantly in infants with PHT.15, 18, 20, 21, 22, 23. Here, EDN1 is linked to pulmonary hypertension, primary, 1.