Aboulhosn and Child offered criteria for identifying a significant coarctation of the aorta. The authors are from the University of California at Los Angeles.
Patient selection: coarctation of the aorta
Criteria for a significant coarctation:
(1) peak-to-peak gradient >= 20 mm Hg across the narrowed segment using an intra-aortic catheter
(2) peak instantaneous gradient >= 20 mm Hg using Doppler velocities
(2a) at rest
(2b) after exercise
(3) continuing antegrade flow during diastole seen on Doppler
Kelly and Amadi report that pressure gradient can be estimated by comparing blood pressure in the right upper extremity and the pressure in the left lower extremity.
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