Patent Foramen Ovale (PFO): Symptoms, Causes & Treatment - Cleveland Clinic
https://my.clevelandclinic.org/health/diseases/17326-patent-foramen-ovale-pfo
webJul 15, 2022 · Patent foramen ovale (PFO) is when you have a small flap or opening between the upper right and left chambers (atria) of your heart. Everyone has this opening, called a foramen ovale, before birth. In most people, this closes after birth. Patent foramen ovale occurs when the flap still exists after birth. “Patent” means “open.”
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