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Published on: February 4, 2021
Bicuspid Aortic Valve Is Associated with Less Coronary Calcium and Coronary Artery Disease Burden
Gudrun Feuchtner1, Sven Bleckwenn1, Leon Stoessl2
1Department Radiology, Innsbruck Medical University, 6020 Innsbruck, Austria.
Insights
Patients with bicuspid aortic valve (BAV) stenosis have significantly less coronary artery calcium and less severe coronary artery disease compared to those with tricuspid aortic valve (TAV) stenosis. Coronary computed tomography angiography effectively rules out obstructive coronary artery disease in most BAV patients.
Area of Science:
- Cardiovascular Imaging
- Cardiac Surgery
- Genetics and Cardiovascular Disease
Background:
- Bicuspid aortic valve (BAV) is linked to genetic factors and aortopathy, potentially influencing coronary arteries.
- Understanding coronary artery disease (CAD) burden in BAV stenosis is crucial for patient management and procedural planning.
Purpose of the Study:
- To compare coronary artery calcium score (CACS) and CAD burden between patients with BAV stenosis and tricuspid aortic valve (TAV) stenosis.
- To evaluate the utility of coronary computed tomography angiography (CTA) in assessing CAD in BAV stenosis.
Main Methods:
- Retrospective case-control study matching 47 BAV stenosis patients with 47 TAV stenosis patients.
- Patients underwent coronary computed tomography angiography (CTA) for assessment of coronary artery calcium score (CACS) and coronary artery disease (CAD) severity.
- Matching criteria included age, gender, smoking status, hypertension, dyslipidemia, diabetes, BMI, and chronic kidney disease.
Main Results:
- Significantly lower CACS (237.4 vs. 1013.3 AU; p < 0.001) and less severe stenosis (CAD-RAD™; p < 0.001) in BAV stenosis patients compared to TAV stenosis.
- More BAV patients had a CACS of zero (27.7% vs. 0%; p < 0.001).
- Non-obstructive CAD was more prevalent in BAV stenosis (68.1%) than in TAV stenosis (25.5%; p < 0.001), while obstructive CAD was more frequent in TAV stenosis (68.1%; p < 0.001).
Conclusions:
- Patients with BAV stenosis exhibit substantially reduced coronary calcification and less severe coronary stenosis.
- CTA is effective in excluding obstructive CAD in the majority of BAV stenosis patients.
- Findings have implications for transcatheter aortic valve replacement (TAVR) planning in BAV patients.
Abstract:
(1) Background. Bicuspid aortic valve (BAV) is associated with genetic defects (NOTCH 1, GATA 5) and aortopathy. Differences in the flow patterns and a genetic predisposition could also affect coronary arteries. The objective was to assess the coronary artery calcium score (CACS) and coronary artery disease (CAD) burden by coronary computed tomography angiography (CTA) in patients with BAV stenosis, as compared to stenotic tricuspid aortic valves (TAV). (2) Methods. A retrospective case-control study. A total of 47 patients with BAV stenosis (68.9 years ± 12.9, 38.3% females) who underwent CTA were matched with 47 TAV stenosis patients for age, gender, smoking, arterial hypertension, dyslipidemia, diabetes, body-mass-index and chronic kidney disease. (3) Results. The coronary artery calcium score (CACS) was lower in BAV (237.4 vs. 1013.3AU; p < 0.001) than in TAV, and stenosis severity was less (CAD-RADTM: p < 0.001). More patients with BAV had CACS zero (27.7% vs. 0%; p < 0.001). The majority (68.1%) of patients with BAV had no or non-obstructive CAD but only 25.5% of TAV (p < 0.001). Obstructive CAD (>50% stenosis) by CTA was more frequently observed in patients with TAV (68.1%; p < 0.001). (4) Conclusions and Relevance. Patients with BAV stenosis have markedly less coronary calcium and less severe coronary stenosis. CTA succeeds to rule out obstructive CAD in the majority of BAV, with adherent implications for TAVR planning.
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