defined Osteum Secundum Defect

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asked Dec 19, 2017 in Medical by naqash (17,900 points)
defined Osteum Secundum Defect

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answered Dec 19, 2017 by naqash (17,900 points)
This is the most common type of ASD and is characterized by the pres­ence of a large opening between the right and left atria. This condition can be the result of one of the following two developmental defects:
a) Excessive resorption of sep­tum primum leading to the formation of a very large foramen secundum, which is not completely covered by a nor­mally developed septum secundum.
b) Inadequate development of septum secundum, so that this septum is too short to cover the foramen secundum completely.
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