in this study , ultrasound doppler color flow mapping systems were utilized to examine flow in the pulmonary artery in 31 premature and term infants ( aged 4 hours to 9 months ) with patent ductus arteriosus accompanying respiratory distress syndrome , as an isolated lesion , or with patent ductus in association with other cyanotic or acyanotic congenital heart disorders .
C0013274
patent ductus arteriosus
C0152021
congenital heart disorders