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What is a PFO?

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Updated September 03, 2008

PFO: A heart abnormality

PFO: A heart abnormality

Photo © A.D.A.M.
Definition: Patent foramen ovale, or PFO for short, is an abnormal opening of the atrial septum, the thin membrane that separates the left and right sides of the heart's upper chambers (known as the atria). PFO is thought to be an important factor in the development of paradoxical strokes.
Also Known As: patent foramen ovale
Definitions of Common Terms Used by Stroke Doctors

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