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Definition
By Mayo Clinic staffTruncus arteriosus (TRUNG-kus ahr-teer-e-O-sus) is a heart defect that creates severe circulatory problems. If your baby has truncus arteriosus, one large vessel leads out of the heart, instead of two separate vessels — one leading out of each of the lower chambers of the heart. Also, the two lower chambers are missing a portion of the wall dividing them. As a result of truncus arteriosus, oxygen-poor blood that should go to the lungs and oxygen-rich blood that should go to the rest of the body are mixed together.
If left untreated, truncus arteriosus usually leads to death within the first or second year of life. Surgery to repair the heart and blood vessels is usually successful, especially if the repair occurs before your baby is 2 months old.
Truncus arteriosus, one of the least common heart defects, is also known as persistent truncus arteriosus.
