In this heart surgery, the surgeon uses stitches to close the PFO . Patent foramen ovale closure is a procedure to close a hole in the heart.We use minimally invasive approaches to treat PFO without open-chest surgery. The foramen ovale usually closes 6 months to a year after the baby's birth. A PFO closure fills an opening between your heart's two upper chambers. How is a PFO treated? Treatment is a catheter procedure or surgery to close the opening in the heart. The foramen ovale is a hole in the wall between the left and right atria of every human fetus. This hole allows blood to bypass the fetal lungs. Jacobi Medical Center, Bronx, NY, USA.