This study has allowed us to describe normative data for the TAPSE and TDI velocities in VLBWIs and to show how myocardial maturation (measured by TnEcho and NTproBNP at 14 DOL) is different in VLBWIs that develop BPD compared to in those who do not develop BPD. Here, NPPB is linked to bronchopulmonary dysplasia.