Usually nothing: A pfo is a remnant of the fetal circulation--everyone is born with this small flap in the wall between the 2 upper heart chambers. For most people this flap eventually fuses shut, but for some it never closes. 10-20% of people are walking around with a pfo and need no treatment or intervention. In the rare cases where it needs to be closed, a catheterization procedure can close it w/o surgery.
Answered 8/10/2013
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