Surgery>>>>>Congenital Heart Disease
Question 1#

The most common form of atrial septal defect (ASD) is:

a. Sinus venosus defect
b. Ostium primum defect
c. Ostium secundum defect
d. Combined primum and secundum defect

Correct Answer is C


Atrial septal defects (ASDs) can be classified into three different types:

  1. Sinus venosus defects, comprising approximately 5 to 10% of all ASDs.
  2. Ostium primum defects, which are more correctly described as partial atrioventricular canal defects.
  3. Ostium secundum defects, which are the most prevalent subtype, comprising 80% of all ASDs.