How might coarctation of the aorta be suspected in utero?

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Multiple Choice

How might coarctation of the aorta be suspected in utero?

In the fetus, coarctation often shows up on Doppler as a smaller aortic arch, especially at the isthmus, with reduced forward flow across that narrow segment. The obstruction creates increased resistance proximal to it, so the diastolic flow in the descending aorta becomes diminished and can even reverse. This combination—arch hypoplasia with decreased flow through the aortic isthmus and altered, sometimes reversed, diastolic flow in the descending aorta—is the pattern that best signals a coarctation in utero. An arch that looks dilated with more flow, a normal arch with strong diastolic flow, or flow abnormalities confined to the pulmonary arteries would not fit the expected obstructive pattern.

In the fetus, coarctation often shows up on Doppler as a smaller aortic arch, especially at the isthmus, with reduced forward flow across that narrow segment. The obstruction creates increased resistance proximal to it, so the diastolic flow in the descending aorta becomes diminished and can even reverse. This combination—arch hypoplasia with decreased flow through the aortic isthmus and altered, sometimes reversed, diastolic flow in the descending aorta—is the pattern that best signals a coarctation in utero. An arch that looks dilated with more flow, a normal arch with strong diastolic flow, or flow abnormalities confined to the pulmonary arteries would not fit the expected obstructive pattern.

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