a prospective study on 150 infants with a birthweight of 1250 g or less was carried out to investigate the effects of patent ductus arteriosus ( pda ) , haemorrhagic pulmonary oedema ( hpo ) , indomethacin therapy and surgical ligation on the development of periventricular haemorrhage ( pvh ) or the extension of pre-existing pvh .
C0013274
patent ductus arteriosus
C0021246
indomethacin