A PATENT FORAMEN OVALE (PFO) IS AN OFTEN-HARMLESS HEART DEFECT. IT IS AN OPENING BETWEEN THE UPPER TWO CHAMBERS OF THE HEART OR ATRIA THAT FAILED TO CLOSE AFTER BIRTH. IN MOST CASES THIS DOES NOT CAUSE ANY PROBLEMS. HOWEVER IT COULD CAUSE SYMPTOMS SUCH AS DIFFICULTY BREATHING OR RECURRENT RESPIRATORY INFECTIONS. PATENT FORAMEN OVALE SEPTUM SECUNDUM OPENING
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