Abstract
Patients with bicuspid aortic valve (BAV) commonly have associated aortic stenosis and aortopathy. The geometry of the aortic arch and BAV is not well defined quantitatively, which makes clinical classifications subjective or reliant on limited 2D measurements. The goal of this study was to characterize the 3D geometry of the aortic arch and BAV using objective and quantitative techniques. Pre-TAVR computed tomography angiogram (CTA) in patients with BAV and aortic stenosis (AS) were analyzed (n = 59) by assessing valve commissural angle, presence of a fused region, percent of fusion, and calcium volume. The ascending aorta and aortic arch were reconstructed from patient-specific imaging segmentation to generate a centerline and calculate maximum curvature and maximum area change for the ascending aorta and the descending aorta. Aortic valve commissural angle signified a bimodal distribution suggesting tricuspid-like (≤ 150°, 52.5% of patients) and bicuspid-like (> 150°, 47.5%) morphologies. Tricuspid like was further classified by partial (10.2%) or full (42.4%) fusion, and bicuspid like was further classified into valves with fused region (27.1%) or no fused region (20.3%). Qualitatively, the aortic arch was found to have complex patient-specific variations in its 3D shape with some showing extreme diameter changes and kinks. Quantitatively, subgroups were established using maximum curvature threshold of 0.04 and maximum area change of 30% independently for the ascending and descending aorta. These findings provide insight into the geometric structure of the aortic valve and aortic arch in patients presenting with BAV and AS where 3D characterization allows for quantitative classification of these complex anatomic structures.
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Abbreviations
- AS:
-
Aortic stenosis
- AV:
-
Aortic valve
- BAV:
-
Bicuspid aortic valve
- CTA:
-
Computed tomography angiogram
- MRI:
-
Magnetic resonance imaging
- STJ:
-
Sinotubular junction
- TAVR:
-
Transcatheter aortic valve replacement
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Breandan B. Yeats has a patent pending as co-inventor of patents related to computational predictive modeling of heart valves and is a stakeholder in DASI Simulations. Sri Krishna Sivakumar has a patent pending as co-inventor of patents related to computational predictive modeling of heart valves. Pradeep K. Yadav is a consultant for Edwards Lifesciences, Medtronic Inc., Abbott Vascular, and Shockwave Medical. Vinod H. Thourani is a consultant or research with Abbott Vascular, Boston Scientific, Cryolife, Edwards Lifesciences, Medtronic Corp, and Shockwave Medical and stakeholder in Dasi Simulations. Lakshmi P. Dasi is a stakeholder in DASI Simulations and has a patent pending as co-inventor of patents related to computational predictive modeling of heart valves. Other authors report no conflicts of interest.
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Yeats, B.B., Galvez, D., Sivakumar, S.K. et al. 3D Characterization of the Aortic Valve and Aortic Arch in Bicuspid Aortic Valve Patients. Ann Biomed Eng (2024). https://doi.org/10.1007/s10439-024-03527-8
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DOI: https://doi.org/10.1007/s10439-024-03527-8