Video 21.13 Narrowing of the aortic isthmus is seen in this sagittal view of a 21-week-gestation fetus
Narrowing of the aortic isthmus is seen in this sagittal view of a 21-week-gestation fetus. Flow acceleration across the hypoplastic arch is low in contrast to the high-flow velocity exceeding the 60 cm/s Nyquist limit, across the arterial duct.