Patent foramen ovale

The foramen ovale is an opening in the part of the heart that separates the upper right and left chambers (atria). In a fetus, this opening has a flap of tissue that acts like a one-way door—it allows blood to flow to the left side of the heart without going to the lungs, and it is kept open by the pressure of the blood that passes through it.

Normally, when the baby is born and takes his or her first breath, blood begins to flow through the lungs, and the foramen ovale closes within a few days. Sometimes, this opening remains open (patent) and is called a patent foramen ovale. A patent foramen ovale is also called a PFO. A PFO happens in about 2 out of 10 people.

A patent foramen ovale is typically not treated and does not cause problems. But it might be treated if other heart defects are present or you had a stroke caused by a blood clot. Treatment includes a catheter procedure or surgery to close the opening in the heart.

Last Updated: October 12, 2009

Author: Robin Parks, MS

Medical Review: John Pope, MD - Pediatrics & Larry A. Latson, MD - Pediatric Cardiology

related physicians

related services

Bon Secours International| Sisters of Bon Secours USA| Bon Secours Health System

This information does not replace the advice of a doctor. Healthwise disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Privacy Policy. How this information was developed to help you make better health decisions.

© 1995-2010 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.