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Aortic pseudocoarctation associated with a stenotic congenitally bicuspid aortic valve
Roderick Tung1, Robert J Siegel
1Cedars-Sinai Medical Center, Los Angeles, California, USA. tungr@cshs.org
The American Journal of Cardiology
|June 30, 2007
Summary
High flow from aortic insufficiency can mimic aortic coarctation, a narrowing of the aorta. This "relative stenosis" resolved after aortic valve replacement, highlighting flow dynamics over anatomical changes.
Area of Science:
- Cardiology
- Medical Imaging
- Vascular Surgery
Background:
- Aortic coarctation diagnosis relies on Doppler ultrasound showing high-velocity jets in the descending aorta.
- Bicuspid aortic valve and aortic insufficiency can present complex hemodynamic challenges.
- Distinguishing true coarctation from flow-related phenomena is clinically significant.
Observation:
- A 23-year-old male with a bicuspid aortic valve and severe aortic insufficiency presented with a high-velocity Doppler jet in the proximal descending aorta.
- Magnetic resonance imaging confirmed a normal aorta with slight tapering, inconsistent with typical coarctation.
- The observed Doppler jet mimicked the appearance of aortic coarctation.
Findings:
- The high-velocity jet and pressure gradient resolved completely after aortic valve replacement surgery.
- This suggests the Doppler findings were not due to anatomical stenosis but rather high flow dynamics.
Implications:
- Severe aortic insufficiency can cause significant regurgitant volumes, leading to high aortic flow.
- This high flow can create a 'relative stenosis' or pseudocoarctation, a crucial diagnostic consideration.
- Accurate differentiation between true coarctation and pseudocoarctation is vital for appropriate patient management and treatment planning.
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