Finite element modeling of a sheep with posterobasal infarction revealed border zone contractility was significantly depressed relative to the remote region, and infarct contractility was zero.
Finite element modeling in a sheep model of posterobasal myocardial infarction demonstrates depressed contractility and elevated myofiber stress in the border zone, which may contribute to progressive heart failure.
Recently, a noninvasive method for determining regional myocardial contractility, using an animal-specific finite element (FE) model-based optimization, was developed to study a sheep with anteroapical infarction (Sun et al. , 2009, "A Computationally Efficient Formal Optimization of Regional Myocardial Contractility in a Sheep With Left Ventricular Aneurysm, " ASME J. Biomech. Eng. , 131 (11), p. 111001). Using the methodology developed in the previous study (Sun et al. , 2009, "A Computationally Efficient Formal Optimization of Regional Myocardial Contractility in a Sheep With Left Ventricular Aneurysm, " ASME J. Biomech. Eng. , 131 (11), p. 111001), which incorporates tagged magnetic resonance images, three-dimensional myocardial strains, left ventricular (LV) volumes, and LV cardiac catheterization pressures, the regional myocardial contractility and stress distribution of a sheep with posterobasal infarction were investigated. Active material parameters in the noninfarcted border zone (BZ) myocardium adjacent to the infarct (T (maxB) ), in the myocardium remote from the infarct (T (maxR) ), and in the infarct (T (maxI) ) were estimated by minimizing the errors between FE model-predicted and experimentally measured systolic strains and LV volumes using the previously developed optimization scheme. The optimized T (maxB) was found to be significantly depressed relative to T (maxR), while T (maxI) was found to be zero. The myofiber stress in the BZ was found to be elevated, relative to the remote region. This could cause further damage to the contracting myocytes, leading to heart failure.
Wenk et al. (Thu,) conducted a other in Posterobasal myocardial infarction (n=1). Finite element model-based optimization was evaluated on Regional myocardial contractility and stress distribution. Finite element modeling of a sheep with posterobasal infarction revealed border zone contractility was significantly depressed relative to the remote region, and infarct contractility was zero.