A PFO is a type of hole in the heart that occurs in infancy. Treatment includes 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. A PFO closure is a procedure that can help lower the risk of a stroke for some people. Treatment is a catheter procedure or surgery to close the opening in the heart. Most people with a patent foramen ovale don't need treatment. Your doctor used a thin, flexible tube called a catheter to place a small device that closes the PFO.