Patent Foramen Ovale (PFO) Causes : Learning Center on Healthline.com

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A patent foramen ovale (PFO) allows blood to bypass the lungs. A baby's lungs are not used when it grows in the womb, so the hole does not cause problems in an unborn infant. The opening is supposed to close soon after birth, but sometimes it does...

Source:ADAM

Date:December 10, 2007

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Patent Foramen Ovale (PFO) Learning Center

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