Everybody has one: The patent foramen ovale (pfo) is a structure all of us have that allows blood circulation to bypass the lungs before birth.After birth, the rise in blood oxygen content from air breathing triggers a gradual closing of the fo.In premi's, it is more likely to remain open & sometimes meds can trigger closure the first wk or so.Persisting fo's can be tied off surgically or closed through a catheter.
Answered 5/24/2012
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