Zip Code 21797 Description. Zip Code 21797 is located in the state of Maryland in the Baltimore metro area. Zip code 21797 is primarily located in Howard County. Portions of 21797 are also located in Carroll County. The official US Postal Service name for 21797 is WOODBINE, Maryland. Portions of zip code 21797 are contained within or border the city limits of Eldersburg, MD, .
A patent foramen ovale (PFO) is a defect in the septum (wall) between the two upper (atrial) chambers of the heart. Specifically, the defect is an incomplete closure of the at â¦ rial septum that results in the creation of a flap or a valve-like opening in the atrial septal wall (see illustration).
Atrial septal defect. (Redirected from Patent foramen ovale) Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart. Normally, the atria are separated by a dividing wall, the interatrial septum.