2D Aortic Arch measures

Suprasternal (jugular) 2D longitudinal view of aortic arch.
Measures: A. proximal arch; B. mid-arch; C. distal arch. AA: ascending aorta; TA: anonymous art. (brachiocephalic); CA: left carotid; SU: left subclavian art.

Measures should be performed “inner edge” to “inner edge”. I prefer to measure the arch at the “exit” point (C), which is also the (normal) smaller diameter, immediately distal to the left subclavian artery. When in doubt about the anatomy (poor image resolution), adding color Doppler may help identify the lumen of the aortic arch, and the correct diameter (gain should be kept low to avoid shadowing of the anatomy of the walls by “overflowing” color signal).

Paolo Barbier


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