Coarctation of aorta
Features Suggestive of Hemodynamic Significance in Coarctation of the Aorta
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Upper-to-lower extremity systolic blood pressure > 20 mmHg
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TTE
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Doppler mean gradient > 20 mmHg
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Corrected COA maximum instantaneous gradient > 20 mmHg
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Diastolic tail in the descending aorta and diastolic forward flow in the abdominal aorta
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Cardiac catheterization
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COA peak-to-peak gradient > 20 mmHg
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MRA/CTA
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Aortic isthmus ratio < 0.5 -0.7
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Angiogram
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Collateral arteries
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References
1) Writing Committee Members∗, Gurvitz M, Krieger EV, Fuller S, Davis LL, Kittleson MM, et al. 2025 ACC/AHA/HRS/ISACHD/SCAI Guideline for the Management of Adults With Congenital Heart Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines. Circulation. 2026 Feb 24;153(8):e115–251. doi:10.1161/CIR.0000000000001402