However, in some premature babies (babies born before 37 weeks of pregnancy), the ductus arteriosus stays open (which is called patent). This means extra blood may flow into the lungs and cause ...
117 patients showed a PDA at first evaluation. 88 newborns were treated with ibuprofen for HsPDA; after treatment 60 patients had a closed ductus (responders) while 28 were non-responders.