Why the study?
The direct hemodynamic link between aortic stenosis, coronary flow waveforms, and spatial wall shear stress remains poorly defined.
Does TAVR mitigate atheroprone coronary flow dynamics and adverse wall shear stress compared to severe aortic stenosis in an in vitro model?
Does TAVR mitigate atheroprone coronary flow dynamics and adverse wall shear stress compared to severe aortic stenosis in an in vitro model?
In vitro and computational modeling demonstrates that severe aortic stenosis creates atheroprone coronary wall shear stress patterns that are significantly reduced by TAVR.
PURPOSE: Aortic stenosis (AS) commonly coexists with coronary artery disease (CAD), yet the direct hemodynamic link between valve function, coronary flow waveforms, and spatial wall shear stress (WSS) remains poorly defined. This study isolates and quantifies how AS-induced flow alterations generate atheroprone coronary environments. METHODS: An in vitro mock circulation loop modeled severe AS (effective orifice area 0.7 cm RESULTS: Compared to TAVR, severe AS produced higher systolic transvalvular pressure gradients (45-70 mmHg vs. 10-25 mmHg) and lower aortic-sinus gradients, particularly at elevated heart rates (HR). Diastolic CBF was elevated at normal HR but declined with increasing HR, resulting in increased pulsatility and reduced coronary flow reserve. CFD revealed larger regions of atheroprone WSS in AS, predominantly on convex arterial curvatures, while elevated WSS localized to concave regions. TAVR reduced adverse WSS exposure by 30-50%. CONCLUSION: AS induces hemodynamic disturbances associated with atheroprone environments through altered coronary flow and adverse WSS patterns. TAVR mitigates these effects, highlighting opportunities for valve design optimization to improve the local coronary fluid-dynamic environment.
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Banay et al. (2026) studied Aortic stenosis. Transcatheter aortic valve replacement (TAVR) vs. Severe aortic stenosis was evaluated on Wall shear stress (WSS) and coronary flow dynamics.
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