| | Healthcare Industry | PPOs What does the medical abbreviation PFO mean? PFO stands for patent foramen ovale, a small opening between the two upper chambers of the heart that fails to close after birth, as it normally does. PPOs - Related Articles What are the role of commercial assistant in wapda? When can you opt out of wearing PPE? Why is the circulatory system a busy system? What does mrcp diagnose? What Is of the (PPHN)? Why do you have to maintain client confidentiality? What is pulse oximetry and why do patients need it?