patent foramen ovale
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patent foramen ovalePFO Cardiology An opening between the left and right atria which allows blood to bypass the lungs in utero; the FO normally closes shortly after birth, but remains open in up to 20%; a PFO is, in absence of other cardiac defects, is of no consequence
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
pa·tent for·a·men ova·le(pa'tĕnt fōr-ā'mĕn ō-vā'lē)
Valvular incompetence of the patent foramen ovale of the heart; a condition contrasting with probe patency of the foramen ovale in that the valve of the foramen ovale has abnormal perforations in it, or is of insufficient size to afford adequate valvular action at the foramen ovale prenatally, or effect a complete closure postnatally.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
patent foramen ovalePersistence of the normal fetal opening in the internal wall of the heart (the FORAMEN OVALE) after birth.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005