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Q: Why does the pulmonary artery close soon after birth?
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What is arteriosus?

Patent Ductus ArteriosusPatent ductus arteriosus (PDA) is a heart problem that occurs soon after birth in some babies. In PDA, abnormal blood flow occurs between two of the major arteries connected to the heart.Before birth, the two major arteries-the aorta and the pulmonary (PULL-mun-ary) artery-are connected by a blood vessel called the ductus arteriosus. This vessel is an essential part of fetal blood circulation.Within minutes or up to a few days after birth, the vessel is supposed to close as part of the normal changes occurring in the baby's circulation.In some babies, however, the ductus arteriosus remains open (patent). This opening allows oxygen-rich blood from the aorta to mix with oxygen-poor blood from the pulmonary artery. This can put strain on the heart and increase blood pressure in the lung arteries.


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After the child is born, the umbilical cord is cut, and the child takes its first breaths, the pressure in the pulmonary vasculature decreases, decreasing the pressure gradient from the left to the right heart, thus allowing the foramen ovale to close.the hole can be closed with a plug if its small and fixed with surgery if its large... in either case normal life can occur.


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