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A congenital heart defect in which there is an opening between the two atria is abbreviated as a (n)

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User Olmo
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That is known as PDA. PDA - Patent ducts arteriosus. PDA is a condition in which the ducts arteriosus does not close. The word "patent" means open. The ducts arteriosus is a blood vessel that allows blood to go around the baby's lungs before birth.
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User Hexaquark
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