<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Chronic lung disease (CLD) is a general term for long-term respiratory problems in premature babies. It is also known as bronchopulmonary dysplasia (BPD).Chronic lung disease is a condition in which damaged tissue in a newborn baby's lungs causes breathing and health problems. The lungs trap air or collapse, fill with fluid, and produce extra mucus.</n0:def-definition><n0:def-source>NICHD</n0:def-source></n0:ComplexDefinition><n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A persistent non-neoplastic disorder of the lungs. Representative examples include: chronic obstructive pulmonary disease, chronic bronchitis, emphysema, pulmonary fibrosis, pneumoconiosis, asbestosis, atelectasis, radiation induced pneumonitis, and radiation fibrosis.</n0:def-definition><n0:def-source>CDISC</n0:def-source></n0:ComplexDefinition>