MCQ : CHD-11
What’s your diagnostic suspicion?
A – Aortopulmonary window
B – Interrupted aortic arch
C – Coarctation of the aorta
D – Anomalous pulmonary venous return
Correct answer is B) : Interrupted aortic arch
Interrupted aortic arch (IAA) is a structural heart defect characterized anatomically by a discontinuity (interruption) along the aortic arch. Depending on the site of discontinuity, IAA is classified into three types, of which type B is the most frequent (50–70%). Type A is less common (30–45%) and type C is rare.
Type A: The discontinuity is distal to the left subclavian artery (approximately in the same region as coarctation of the aorta).
Type B, the most common form: The discontinuity is more proximal, between the left carotid and subclavian.
Type C: The discontinuity is more proximal still, between the brachiocephalic artery and the common carotid artery.
