Patent foramen ovale and atrial septal defect closure is a routine procedure to close holes in the upper chambers of the heart. The foramen ovale usually closes 6 months to a year after the baby's birth.This hole is normal in the heart before birth, as part of the fetal circulation. But in most people, it closes soon after birth. A PFO is closed using during a procedure called cardiac catheterisation. In this heart surgery, the surgeon uses stitches to close the PFO . 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. A catheter was introduced into the right atrium, and contrast medium injection proved the suspected patent foramen ovale (PFO).