Hypoplastic left heart syndrome. Color Doppler of both arches
by Nanda Navin C

Comprehensive Textbook of Echocardiography

by Navin C Nanda
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This video clip showing color Doppler of both arches. The point (*) is the isthmus and there is retrograde filling of the aortic arch (AoAr) from this region (red flow toward the transducer). Both arches should be antegrade and symmetric. Presence of asymmetry is a subtle clue to possible hypoplasia, but retrograde flow indicates severe obstruction of one of these arches and is a ductal-dependent pulmonary or systemic circulation at birth.

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