Patent Foramen Ovale: According to Dr. Jonathan Marmur> " In approximately 25% of adults the foramen ovale does not seal over." In that situation when pulmonary circulation pressure is elevated then the foramen ovale can open up. REF: http://www.marmur.com/ASD-PFO.html Most adults wtih a patent foramen Ovale don't have any symptoms. However, it can increase risk for stroke. Please see this excellent fact sheet:
Answered 11/2/2017
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