An interventional cardiologist inserts a catheter (a thin, flexible tube) into a large artery in the groin. Interventional Cardiac Procedures in adults with congenital heart disease and patent foramen ovale.Patent foramen ovale (PFO) is a hole between your heart's upper chambers. 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 test called an echocardiogram is used to diagnose a PFO. The test uses sound waves to create pictures of the beating heart. A PFO closure uses a medical device to close an opening between your heart's two upper chambers. You only need this opening as a fetus. Patent foramen transcatheter repair is a procedure to fix this hole in the heart.