The PaO 2 rises dramatically, from fetal levels of 30 to 40 mm Hg to ... its patency is often apparent on echocardiography for up to, and occasionally beyond 24 hours after birth.

Background: Indomethacine treatment for patent ductus arteriosus (PDA), might lead to vasoconstriction of cerebral blood vessels and under-perfusion of the brain. A lower infusion rate might ...

Cite this: Current Controversies in the Diagnosis and Treatment of Patent Ductus Arteriosus in Preterm Infants - Medscape - Aug 01, 2003. The DA of a very preterm infant has minimal constriction ...