PS206. Wall Thickness Influence on Computational Wall Stress of Arteries

Abstract

Objectives: Biomechanical analysis can predict mechanical stresses in cardiovascular structures. Prior models often assume uniform arterial wall thickness (WT). We hypothesize that including local WT in finite element analysis (FEA) of the carotid artery will effect wall stress (WS) distribution and maxima. Methods: CTAs in patients with carotid occlusive disease (n 5) were analyzed with custom algorithms to segment luminal and adventitial surfaces, providing local WT. A control model was defined with variable wall thickness (VWT) and hyperelastic material properties (MP). Experimental models tested the effects of: (1) uniform wall thickness (UWT), (2) soft and calcified plaque, and (3) linear MP. Commercial FEA software was used to load each model with 80 mmHg pulse pressure and compute Von Mises WS. Results: The mean (across n 5 patients) peak WS of the VWT model was 162 29 kPa. Peak WS decreased with the imposition of UWT (112 19 kPa, P .01) and with linear MP (105 24 kPa, P .01). UWT decreased both the average WS over the entire carotid bifurcation (31 4