A Patent Foramen Ovale (PFO) is a flap-like opening between the two upper chambers of the heart. It is a remnant from the fetal circulation that usually closes at birth. However, in about 25% of the general population, it remains open or patent. While a PFO is usually harmless, in some cases it can allow blood clots to pass from the right side of the heart to the left side and travel to the brain, causing a stroke. PFO closure devices are minimally invasive implants ... Read more
