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Dictionary: Prostaglandin

Prostaglandin (prahs-tuh-GLAN-din): medicine that keeps the ductus arteriosus (a small blood vessel in the heart) open. The ductus arteriosus connects the pulmonary artery (the artery that normally carries blue blood to the lungs to get oxygen) and the aorta (the artery that carries red blood to the body) open. It usually closes shortly after birth. In some heart problems, it's critical to keep the ductus arteriosus open for a while.