Key result
Simulations of abnormal left ventricular wall movement using a finite analytic viscous flow model displayed asymmetric flow, backflow, recirculation, and decreased pressure gradients compared with normal wall movement.
Why the study?
Potential flow models may inadequately represent left ventricular fluid dynamics due to neglecting viscous effects, necessitating a more accurate numerical simulation.
Viscous flow models using the finite analytic method provide a more accurate representation of left ventricular fluid dynamics than potential flow models, particularly in demonstrating abnormal flow patterns.
May guide viscous flow modeling of LV dynamics; leaves open clinical validation before any practice implications.
In this paper, a model is described that provides a numerical simulation of flow in a contracting cavity with a single outlet and arbitrary user‐supplied wall motion. The numerical solution is obtained by discretizing the Navier‐Stokes equations for viscous fluid flow using the finite analytic (FA) method. This model is first compared with a closed‐form potential flow solution using a spherical geometry. Then the model is applied to flow within the left ventricle of the human heart using successive cine‐angiographic images of the left ventricular outline to obtain wall boundary conditions as input to the model. Qualitative differences existed between the potential and viscous flow solutions, clearly proving the importance of viscous effects and casting doubt on the use of potential flow models in the study of left ventricular fluid dynamics. Simulations of abnormal left ventricular wall movement displayed asymmetric flow, backflow, recirculation, and decreased pressure gradients compared with simulations of normal wall movement.
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Schoephoerster et al. (1993) studied Left ventricular fluid dynamics. Finite analytic (FA) method model for viscous fluid flow vs. Potential flow models / normal wall movement was evaluated on Flow dynamics (asymmetric flow, backflow, recirculation, pressure gradients). Simulations of abnormal left ventricular wall movement using a finite analytic viscous flow model displayed asymmetric flow, backflow, recirculation, and decreased pressure gradients compared with normal wall movement.
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