ASD vs patent ductus: These are not the same thing, an atrial septal defect, or asd, is an opening in the tissue separating the left and right atrium. The ductus arteriosos is a structure present in fetus which allows blood to bypass the lungs and go to the placenta, this usually closes at delivery but can be closed surgically if needed. Often doctors use medications to close it after delivery.
Answered 7/5/2012
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No: ASD is a hole between the upper heart chambers. Patent ductus is a pipe that connects the right heart pump outflow to the aorta, allowing most of the blood to go to the body instead of the lungs (since they are not in use). The PDA is supposed to close when the blood oxygen level increases with breathing. The ASD is just a defect.
Answered 7/27/2017
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