A 12-month-old child is diagnosed with an atrial septal defect. What is the most common cause of such a congenital heart malformation?
a. Failure of formation of the septum primum
b. Failure of formation of the septum secundum
c. Incomplete adhesion between the septum primum and septum secundum
d. Malformation of the membranous interventricular septum
The Correct option is C
Explanation with High Yield Facts:
The most common form of atrial septal defect is located near the foramen ovale (not to be confused with a patent foramen ovale, which is of little or no hemodynamic significance). They result from incomplete adhesion between the septum primum and the septum secundum during development. Atrial septal defects less commonly result from failures of formation of the septum primum (choice A) and septum secundum (choice B). Malformations of the interventricular septum (choices D) cause ventricular septal defects rather than atrial septal defects.
0 comments:
Post a Comment