What sonographic signs suggest interrupted aortic arch prenatally?

Prepare for the Fetal Echocardiography Test. Utilize flashcards and multiple-choice questions that come with hints and explanations. Ace your exam preparation!

Interrupted aortic arch shows up on fetal ultrasound as a visible gap between the ascending and descending portions of the aorta, so there is no direct continuity from the heart to the descending aorta. In the fetus, distal systemic perfusion relies on the ductus arteriosus, which channels blood from the pulmonary artery into the descending aorta. Therefore, the distal aorta is ductus-dependent for perfusion. This combination of an apparent discontinuity of the aorta with distal systemic flow maintained only through the ductus arteriosus is the hallmark sign. The other options don’t fit because a continuous aorta would not indicate interruption, a discontinuity between the pulmonary arteries isn’t the problem described, and disruption of the ductus arteriosus with normal distal perfusion isn’t the typical prenatal pattern for this condition.