babies were admitted to the study if they had a roentgenogram and clinical diagnosis of bronchopulmonary dysplasia , were 2 to 6 weeks in age , weighed less than 1,500 g , had made no progress in weaning for the preceding five days , and were free of sepsis , patent ductus arteriosus , and congenital heart disease , and had had no intravenous fat for at least 24 hours .
C0013274
patent
C0152021
congenital heart disease